Impotent Scorpio (gemini moon, taurus rising, sag venus)?

About a year and a half ago I met a wonderful Scorpio. We shot pool together one evening and the attraction was immediate. I had a serious crush and I feel as though he felt the same. The next time I saw him there he was with his girlfriend so out of respect I backed off and just kept it platonic. We are both regulars at this place and see one another often. (2x a week) About a month ago when asked where his girlfriend was since she was not with him he explained that it was over and that it had been for a while. The next week I confessed my crush and we have been inseperable ever since. He is very affectionate, attentive (down south country boy) polite, mannerable, funny, and despite being a Scorpio doesnt seem very jealous, demanding of my attention but not jealous or territorial and calls when he says he will, comes to me at a drop of a dime. Problem: The other nite we kissed and touched ually for the first time. I am excited b/c size (huge), touching, and everything is just right for me, however he b/c stiff then kept going Down! I asked if that was the first time it happened and he said no, but wont go any furthur into it. I asked if it was me and he vehemently said no he wanted me bad. The Experience still was beautiful despite this, b/c he gave outstanding oral and made sure I was satisfied, although I was upset that he was able to climax and there was no . Next day I tried to talk about it, asked if he was nervous he says no. Doesnt know why it happened. He has shut me out about the subject but all the affection is still there. I really, really like this guy but ual chemistry is VERY important for me. Not sure how to handle this with ultra private Scorpio. He has Gemini moon, Taurus rising and Sag venus. I am Virgo with Leo moon, Libra rising and venus. Oh also: he officially asked me to be his girl last nite. I said yes, but am scared