Should I try therapy?

I have frequent nightmares about things that have happened to me - but I haven’t experienced anything serious. It’s mostly being cheated on by my ex and being bullied at school. I wake up screaming and crying and have to sit through the living room with the windows open until I calm down. I also get triggered easily and start crying and sweating and wanting to harm myself and hyperventilating. My boyfriend says I should see a therapist but I know I’m just getting upset over an ex that was seeing other people so that’s not a serious problem and it’s just me being over emotional! I’m not saying my feelings are invalid because I was completely broken when I found out. But I don’t think therapists really care or want to spend time on someone that’s still upset over a bad break up? 😂 idk what are your thoughts?