Rant ahead:

I’ve had this type of same problem in my past relationships. When I would have a breakdown one would normally expect your partner to be there for you to comfort you, correct? Because this is what my therapist at the time told me that our partners should take care of each other when we are in need of comfort. But my partner at the time would just watch me breakdown and not do anything not even be an inch close to me, he would just wait it out. Until he told me one time, which is probably the worst thing told to me is, “he feels like a babysitter when I’m having a mental breakdown”. (I experience Derealization/Depersonalization) this was the reason I would breakdown maybe once or twice a month because I was having a massive episode. 
I had told this to my therapist and she said that was not right for him to do. Time passes by we end our relationship on good terms and he apologizes for doing that to me and realizes it wasn’t right to do that to me.

Now the present: I am currently with a new partner and it somehow popped into our conversation but I had let him know about this type of situation with my ex. And he told me that was really bad and that he felt bad that happened to me and that he would never do such thing. This started happening more recently and he has started doing the exact same thing. I have a breakdown out of no where or a panic attack and he just keeps doing what he was previously doing. I’m crying in the middle of the room and he just ignores me. I don’t know if I am just to full of myself or what am I doing wrong? Am I asking for too much? I just need a little bit of comfort like how I show to him? Is it all in my head? Why does this happen to me in different relationships is it me? 

I need an outside look on this. Please.