Confused on what to do


I know at the end of the day it’s what I need to do but I have 4 month old baby and in February my partner told me he slept with someone and that he has been taking to this girl for a while, and that he has a sex addiction and porn addiction so we talked for a while broken up and I decided I wanted to get back with him so we did and and it’s been a couple of months and the pain hasn’t eased.

I’m just curios if anyone else has been in this situation and there opinions would be nice