Help me. 😖

So I've been hanging out with this guy for a few months now. Nothing official because honestly I've been married (married at 19 & divorced by the age of 20, I'm now 21) & that plus past horrible abusive relationships has pretty much fucked up my head. So now I constantly wondering what he's doing or who he's with. I'm terrified & im stressing myself out. Help me, I don't know what to do. Am I crazy or is this normal for me to feel this way?