Where did the sex go in our relationship?

If your significant other is unwilling to work on the problem, be it a medical issue, or something going on in the relationship on either of your parts, despite you having tried to discuss your concerns with him, especially if he only gets intimate with you after these discussions but makes you feel guily about it, than it is highly unlikely that his behavior will change. And because this is causing a rift in your relationship and he doesn’t seem to care about that, it is a likely possibility that the two of you will not be able to fix this and that the relationship will not go back to that blissful first month. You say that this could lead to cheating, well this might already be happening. Or it might be just down the road for you or him. My advice would be to have a final discussion with him and tell him that if he can’t fix his issues, or tell you what his issues with you are, than there really is little point in continuing the relationship. I dont mean to say that intimacy is the only reason to be or not be with someone but it constitutes a big part of a relationship, no matter what level the intimacy is. If he is unwilling to work out this problem, what other problems will he not care about fixing in the future? Or what ones is he ignoring now? You dont deserve to feel guilty, and he shouldn’t feel pressured. “Love” can not sustain a relationship alone. Good luck