Need advice 😤😩😅

So my boyfriend and I have been part of each other lives for 4 years now and been dating on and off. We have been together for almost 5 months now and he's already cheated on me, but I'm possibly pregnant.

If I am pregnant I want to take a break with him to give him a reality check because ever since he moved out if his parents house he's been out of control. Partying every night, smoking, getting in trouble, ect....anytime I try mentioning kids to him he tells me he doesn't want any and that he's not ready to be a father, but the other day he said he wants kids.

I want to do that break because I feel like it will one give him that reality check and two show him that if he cheats again he's not losing me, but the baby too.

But if I'm not pregnant I still wanna take a break because him and I have constantly been fighting ever since he moved out too. We probably go one day out of the week without fighting and when we do fight it's about something he sent me saying stuff about another girl or some girl that flirts with him.

Sorry it's long but I need advice ladies 😩