In need of emotional advice

So something happened this morning and I don't understand it.

So to start I have had really bad relationships.

But this morning my bf went to go hug and kiss me before he went to work. I was in the kitchen while I was making breakfast and I love his hugs and kisses but this morning I felt trapped and scared. Idk why but it brought up old memories of when my ex used to trap me in our room and scream at me when I would try getting away from him. I panicked and shoved him away.

I know 100% he wouldn't ever hurt me. I don't know why that popped in my head. But it's not the first time that was just the worst that it has happened.