I hate to tell you but he got sex and he's moved on. You should to. Most people don't realize that once you give in and have sex, it's over...that's all they want

It's possible. You just have to control those feelings. Did you have feelings before having sex, or is this all because of the sex? If you really liked this person as a friend, take a step back and try to return to how it was before you had sex, and don't have sex again.

Sex is an EXTREMELY powerful influence on our emotions. How it affects one person is different than how it affects another. Many people who are friends recognize this and choose NOT to introduce sex into an otherwise platonic relationship because they don't want the situation to end up with one person feeling one way and the other feeling differently. That your feelings have changed is no surprise, when you realize how powerful an influence sex is. HOWEVER, just because your friend says he just wants to remain friends DOESN'T mean he doesn't care for you. It merely means he DOESN'T want an intimate relationship in which the two of you are considered a 'couple' and all that it implies. What you need to decide is whether or not you can live with that arrangement. It doesn't mean you have to continue sexual relations with him. It doesn't mean you have to depart as bitter emotional enemies. And it doesn't mean you can't be friends. You could simply be friends who have shared something special. I don't know you're friend's motives in this are, and I suspect you may not either. You need to ask and be clear with each other. Nothing will destroy a friendship quicker than misunderstandings over intimate details. If he's happy to have a sexual relationship with no additional strings attached and you aren't, then you need to tell him that. If he's happy to have had such a wonderful experience with you, but doesn't want to take it any further, then you have to tell him how you feel about that,too. If you can't work things out together as friends, then you must part ways. And this also doesn't have to be something horrible. It's simply something the two of you have decided is NOT mutually beneficial. Sad, perhaps, but NOT bad.

If you feel that there is enough content in your previous friendship to stay friends, I would try to manage your feelings. Some women, when they have been single for a little longer than what they're used to will attach themselves more emotionally than before to the nearest male counterpart. I have been in this same situation, and still find myself fighting with my feelings for him sometimes. Friendships are worth so much more than sex...I would suggest that you discuss things with your friend as well and draw out expectations and boundaries. If you plan to maintain the sexual aspect of your relationship be clear that you don't want to become a doormat, and treat him the way you expect him to treat you.