Need advice

Edit: yes he knows she is not his.

So, this is my story.. I just need help. (Kind of long sorry)

I feel like the worst person on earth.. my partner and I have been together for 11 years now.. we got together when I was 19 and he was 25.. about 6 years ago when our first son was born he stopped sleeping in our bed. His valid excuse was since we just had a baby he couldn’t sleep in the same room because he had to get up early for work the next day.. I accepted it for a while. Once our son was about 6 months.. I would ask him to come back to bed and for whatever reason he would make up an excuse or say he’ll be right in and fall asleep on the couch, I communicated that I felt lonely and abandoned due to the fact my partner wasn’t sleeping with me.. which fell on deaf ears. Fast forward 2 years later(still not sleeping in the same bed) we have our second son, now he has the excuse again of still not sleeping in the room because of a new born. When my second son was about 3 I went to a kid’s event with them and saw an old friend.. we were catching up and one thing led to another and I started seeing this man romantically.. after a couple months I stopped things with him and told my partner what I did to him.. he forgave me and we went in about our lives… then again I ran into him and it was our last time together and I got pregnant.. I now have a daughter by this man but still live with my partner. My daughter is only two weeks old..

I don’t know where I’m going with this story I just needed someone to tell.. and someone to tell me what to do now.