You should think that he wanted sex, and that you gave it to him, so now he's backed away again.
PLEASE be careful, Britt. I'm with Trent -- no more ML with your husband! But if you do, for god's sake, please use protection.
Puppy
Puppy is right -- if you are not on the pill right now or some other kind of birth control, go and buy some condoms ASAP. In fact, I think I'm going to do the same...
If you do end up having sex with him (for whatever reason), you won't complicate your relationship issues with an unintended pregnancy.
I was thinking more about unintended STDs. You don't know where his head is right now. Either one of them.