Should i stay or leave

Lovelie • Live laugh love
So I found out that my kids father has been trying to be intimate with another woman I confronted him about it today and he tried to deny it but eventually it's as if he admitted it by saying if I had sex with him more often he wouldn't be seeking it elsewhere I do love him so I'm stuck and confused as to whether I should stay with him or leave I do want this to work for the sake of our son but I don't want to be miserable for the rest of our lives help what should I do?