I was in a relationship for 5 years...

I was in a relationship for 5 years, we broke up because he’s mentally abusive and physically and we have a son together.. anyways we have been broken up for like 6 months and I started seeing this new guy and he’s GREAT he’s so sweet I really like him and we have gotten close. But as soon as I feel like it’s getting serious my mind tells me to RUN and then I get scared and usually I’ll stop talking to guys completely or even block them or stop seeing them.. Is it because maybe I’m not ready? Idk i constantly feel the need to RUN RUN RuN when things feel like they are getting serious... I just need advice.. I don’t want to punch him away.