Very sad

I found out my boyfriend was cheating on me and slept with another girl a year ago while we were broken up i am currently 15 weeks pregnant and i want to figure out how to forgive him i love him a lot and ik i have to set more/ different boundaries i really just want our son to grow up with a loving family i want to figure it out i left his house yesterday and im really lonely and sad all by myself i don’t have any friends or family to help me through this i just really want him back i can’t sleep or eat without him he helps me get through a lot i really want to forgive him and start over

P.S sorry for the vent

EDIT i’m saying he cheated on me like just a few days ago with the girl he slept with and what i mean by break up is like a break from each other