Redflags.. am i right or just paranoid?

Okay so i use to be in an abusive relationship so i notice red flags easily now.. well some red flags... I've been talking to this guy for a couple months now and he's really sweet when he talks to and he's the first guy to ever really get me things which i think is adorable but recently he's been acting very strange at moments. Like sometimes when we r hanging i'll try to get up and he'll grab my wrist to the point it hurts and yank me down and try to kiss me... i usually get scared b.c of my ex and im afraid he'll hit me but it fades and i kiss him back.... but then a couple days ago we were making out and i went to pull away and he grabbed me wrist again and slammed it on the bed... i thought that he might of been gettin frisky but when i tried to push him off with my other hand he did the same and it hurt! and he tried to kiss me.. i told him to stop and eventually he did after awhile... do u think hes just frisky or a threat cuz it scares me to no end when it happens but once its over hes the sweetest guy ive met... i still haven't told him about my ex and how he use to hit me....