Can I talk about an ex with a new partner?

So I ended my first “actual” relationship a while ago. I’m with someone new now (I love them in a way I didn’t know I could love someone) and I really enjoy them. My ex sexually and emotionally abused me for some years. Have some trauma from it blah blah blah

I really like this new relationship and don’t want to fuck it up. In my last relationship every problem of mine that I brought up was brushed under the rug and dismissed or even used against me.

Not too many people know about the sexual abuse and it would just be nice to have someone to talk to.

Is it ok to talk about that with my new partner or is that something that would be bad to do? I don’t dwell on my ex or think about him at all (at least not in a positive way haha) so it wouldn’t be like I was stuck on him.

I’m a really guarded person and I would like to be more vulnerable. Is this something that is ok to be open about and vent about to a romantic partner? Would it be better to just talk about this with friends?