<human>: Can you condense the text into a few key points?

I've been in a very happy nine month relationship with my boyfriend and we still haven't had a major fight or argument. This is also a worry of mine. My boyfriend has a history of ending relationships on a whim.  

Before we started dating, him and I were close friends. So I knew three of his ex-girlfriends and all of them seemed like great girls. However, each one of them were randomly dumped. Nobody saw it coming. He claims he couldn't trust them anymore, which is why he ended each relationship. He dated each of them for nearly a year.

He's never jealous or possessive. But I've been extra careful not to put him in a position that would make him doubt his trust in me. 

Nine months together and we still haven't had a big fight. I know it's inevitable because nearly every couple has them but I'm scared he'll end our relationship on a whim like he did his previous ones.

I want to talk to him about this but I'm not sure what to say. I guess I just want to make sure he doesn't give up on us as soon as something bad happens or if we hit a rough spot. Am I being irrational?
<bot>: I'm scared history is going to repeat itself and he's going to randomly dump me like he did his previous girlfriends.