Heartbroken

So i went through my fiances old phone... And saw text messages and nudes from a lot of different girls and he's telling them he loves them and ect i didn't see all this til yesterday. While all that was going on I was pregnant at the time. Now our daughter is 4 months old and I'm barley seeing a this I'm so heart broken idk what to do i just want to leave him. He's such a liar and a cheater. I'm so broken rn....