@sally27 ,
I've always thought that life was about lessons learnt. What we take from those lessons can either better us or destroy us.
7 years together builds a strong connection, bond, possibly one of great friendship. Add, your school, his work, like everyone on this planet unless time is also taken out to smell the roses, they wilt.
Your husband knows your "character" and knew your character before he married you. He's probably scratching his head of what next to do to bring things alive again. I can't tell you what you are feeling for this other guy because it's your reality but when there are things missing in ones life, it tends to present itself. You may very well find that out and be able to then work on that with your husband.
I don't think it's worth throwing away a good bond, a form of love over a fly by situation. Your husband knows you and accepts you for who you are, what you need to do in my opinion is find out more about who you are, perhaps there's a different side to you than you realised, maybe sex was sex to you, perhaps there is a lesson somewhere here that it's not just "sex" perhaps sexuality or sensuality within yourself, only you will know that if you ask yourself that question. Maybe some good can come out of it in the end but remember, your husband would be feeling less of a man (perhaps) in the knowing now that his wife went elsewhere, so have some compassion as well if you intend to stay and stay only if you intend to believe there is a chance you two can finally work this out of being a couple.