What he said is that he doesn't like his ex-girlfriend, but after all, he spent some time with his ex-girlfriend, which must be emotional!
And their feelings for each other are not necessarily light!
He broke up with his ex-girlfriend. I don't know how long it took him to get to know you and your other half again, and then for some reason, you broke up again!
I wonder whose problem it is! If this problem is caused by his problem! Maybe he is "easy virtue" and he is not single-minded about his feelings!
I don't know your boyfriend, of course you have some judgment! If he is a bad person, don't dwell too much on this issue, find someone who really loves you and hurts you!