my ex and new bf

so I just found out I'm pregnant!! In July of last year I met my boyfriend and we had been together for the past year in the last 6 months it was rough and I began to hate him but kept thinking it would get better or easier. so I stuck around cause with every attempt to end it I would get the same answer of "no were gonna work this out I love you" blah blah blah.. Well at the beginning of june I came back to my hometown and reconnected with a old friend we did sleep together and then I left to go home again.. me and my bf made it 2 weeks before we both finally called it quits. I ended up coming back home to "rereconnect" with this guy again. And come to find out I'm pregnant. The whole year me and my bf had unprotected sex in hopes that maybe it might happen just to I guess make us happier and never did and now I had sex with this guy I'm now pregnant! I'm confused cause im now so happy with the man I'm with and don't want to change a thing but if it's my exes he does deserve to know right? I just don't want to deal with that asshole for the next 18 years!!