it depends how much you value your new relationship and if you think you can just say sorry and go no further, it might give both of you a kind of closure and release the bitterness :)
are you the one who initiated the texting? if so, maybe you are trying to read too much into his response. It is reasonable for him to let you know that he does not hate you after your harsh words (translation: I am in a relationship now, so what you said back then really does not matter anymore!) I see no evidence that he wants to pursue anything. Rather, it sounds like he wanted to give you some peace of mind, and then move on.
Sounds like your not over him if you have to ask this question.
It means that there is still some unfinished business. Some things that still need to be said. You need closure.
for me no! After the brake I would stay with who makes you happy
it means he wants a booty call