<human>: I've been casually seeing a guy for about 5 months. We spend almost every night together so it's somewhat emotionally serious. 

I have a hard time being confident or being around him when he's angry, and I know he can tell I'm holding something back but he's told me he'll wait until I'm ready to talk. I haven't told anyone about what happened with my ex (21, M, ~3 year relationship) but it's made me a shell of who I used to be. 

I get the feeling my new SO thinks he's the reason I'm a little emotionally withdrawn, and I think telling him would make him more comfortable about where we lie. However, I also think it's very inappropriate to bring up a bad previous relationship, especially because I feel like it looks like a giant red flag against me.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Got out of 3 year abusive relationship, 3 months later hop into a new (much better) relationship and I don't know whether or not to tell the new SO about the abuse.