Keez, I'm a NT married to another NT. I do have an autistic son though.
Jealousy is not a pleasant emotion so why would someone want to provoke it in someone they love? This does not make sense.
I completely agree with Gareth -- It's not good to make your parter jealous. However, NTs (men and women) sometimes do deliberately try to make their partner jealous. When we feel jealous, we are (usually) afraid of losing our partner to someone else. When NT are jealous they can show a wide range of reactions. Sometimes they react by becoming more affectionate towards their partner.
For example, if a woman sees her man looking at other women, she might think to herself, "Oh no, he's looking at other women. He must not be satisfied with me. Maybe if I try to be sexier, more affectionate towards him, and/or more accommodating to his needs, I won't lose him to someone else."
You can probably see how people might like the idea of making their partner want to be sexier, more affectionate, and more accommodating to their desires. So, some NT men and women try to make their partner jealous in the hope that he or she will react as I described above.
In my opinion, it's still a very bad idea to try to make one's partner jealous. No matter how good a person may be at understanding other people, no one can ever predict with absolute certainty that their partner will respond to jealousy in the way that I described above. Sometimes, when people are jealous, they get very angry or may even choose to end the relationship because they are tired of their partner making them feel bad.
In my opinion, it's also a betrayal of trust. I think about it this way: when my wife chose to be with me romantically, she essentially made a decision to trust me not to do something to hurt her. If I were to then deliberately make her jealous, I would be betraying her trust.
As someone else said, it might be that he wanted you to wear a top like the one she was wearing. If he had just been looking at her *JUST* to gawk at her, he probably wouldn't have pointed her out to you like he did. The fact that he deliberately directed your attention to her top makes me think that he probably wanted you to wear a top like that. It sounds like the top she was wearing may have shown a lot of the woman's breasts, and he probably really liked that. He might have been fantasizing about how sexy you would look if you were wearing that same top, and pointed it out to you in the hope that you would wear something like that in the future.
He might have been expecting you to figure out that he wanted you to wear a top like that, and misinterpreted your confusion as an unwillingness to do that. If so, then it sounds like he doesn't quite understand aspies that well. (That's very common -- I'm not sure most NT have even HEARD of Aspergers.)
When I am out in a public place I find my partner the most attractive individual present. I am not interested in examining the physical attributes of those around me apart from in terms of who might present a threat of violence.
Even if I was comfortable looking at others I would not want to attract their attention as I am unavailable and because I would not want to inspire jealousy in my partner.
This seems logical to me. Is this aspie reasoning? or 'female' reasoning or it just me?

I don't think that's way of thinking is specifically an aspie thing. I think it has more to do with maturity and wisdom. I'm as NT as they come, and I think about jealousy the same way you do. If I am out in public with my wife and I see another woman that I think is beautiful, I will usually look away from her very quickly. I care more about making my wife happy than I do about getting whatever small amount of enjoyment I might get from gawking.
However, I have found that there is a wide range of beliefs among NT about whether or not it is acceptable to look at other attractive people when you are in a relationship with someone. Some people think that it is never acceptable. Some people think it's ok if you are by yourself but not when your partner is with you. Some people think it's ok to look when you are out with your partner as long as you are not obvious about it. Some people think it's always ok to look as long as you don't actually have a romantic involvement with someone else. If it bothers you for him to look at other women, I would suggest telling him. He might apologize and try not to do it, or he might get angry. But, if it bothers you for him to do that, he certainly isn't going to stop doing it if he doesn't know that you don't like it.
It sounds to me like you have a far more mature understanding of jealousy than most NT do.
The other thing that I thought about when I read your post was this: It doesn't sound like your partner really understands autism all that well if he found your confusion surprising. Does he know that you are an aspie? If he does know, how well does he understand how you look at the world? If he doesn't really understand the differences between autistics and NT, that might lead to a lot of problems between him and you. It might help the two of you understand each other better if he understands the differences between aspies and NT better.
Even if he does understand aspies, he will still make mistakes sometimes. After all, it's hard for anyone to fully understand another person, particularly when the other person is different. When I am angry at my son, I sometimes find that it really annoys me that he won't look at me when I am telling him why he shouldn't do whatever it was that made me mad. I have to consciously remind myself that his lack of eye contact doesn't mean that he doesn't care about what I am saying. I have to consciously remind myself that he is autistic and just doesn't like looking at my eyes. I know this, of course, but when I am angry I don't always think things through logically. I don't know if aspies have this problem or not, but we NT often become illogical when we are experiencing strong emotions.
You might talk to your boyfriend and ask him if he would like you to wear an outfit like the one that woman was wearing. He might respond by saying something like, "Yes, that was why I pointed it out to you".