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You have to voice your concerns to him and let him know that the way he talks to her bothers you because you would never do that to him. He may be doing it because you allow him to you have to set boundaries when it comes to your mate and their exes though it doesn't bother you to the point you don't think he is cheating why take that chance that later down the line that won't happen because he may take your trust as you not caring and you don't want to come off like that. Talk to him and explain to him though you don't care that he takes to her and remains friends with her you do care about some of the things he has said to her about the past and thoughts about the relationship, that is crossing the line and he has to know that wasn't okay.