My SO wants to sex me all the time!

Okay so my bf and I have been together for almost 2 years and we have also been off and on as well. We have been through (a lot!!) hence the breaking up and getting back together but still managed to make it back to each other.

But recently him and I have been getting into small debates about him wanting to have sex with me every single day!! I know that while we were broken up for that small amount of time he was seeing someone else and told me that she would give him some whenever he wanted.

Well now its starting to become a real factor in our relationship because I don't find myself as inclined to have sex to him as he does I. But he says it doesn't bother him and i know it does.

Idk if it is because I feel he is trying to compare our relations or because I could possible be stressed

But I do know I love him & wanna be with him and I really am afraid of losing him because of this. I DIDN'T feel comfortable to do this but I need advice !!!!!!!! Please