Trusting your boyfriend with the baby

I've been single since the week before I found out I was pregnant and now my son is 6 months. I'm wanting to find a boyfriend and potential husband but when I think of leaving my baby with someone that isn't family my anxiety spikes. I keep thinking what if he molests, hits, or neglects my kid? I probably wouldn't even know. How can you know who you can trust and how do you learn to trust them? I was abused as a kid and no one knew so I think that's where this worry comes from