@Jrabe528,
Dear.
I think you should try to talk to him one more time and say something like "My dear John/Andre/Julio -- please, listen to me. Hear me. I like sex with you, it is always great. But for me it seems to me that except sex we do not have any kind of other interests during weekends.
I am literally exhausted. I want calm weekends not full of sex. I want to spend time with you differently. This is not connected to the fact that you are not attracitve or that I do not like you. On the opposite, I really like you. But there is too much of intimacy... It makes me feeling pain rather than pleasure".
Something like that.
I also think that some different challenges can help you in this situation. Something like "Let´s not have sex for about a week or two days on weekends and this will give to both of us some relax and good energy". I have not been masturbating for over a week while my ex-GF had her "red" days. So, maybe something like that will help you.
If nothing helps, than it is a moment of breaking up.
And remember: cheating is not a question of a high libido. It is a choice.