This background helps to bring your BF into a better light for me. I wonder how he can be truly intimate and vulnerable with you if he still harbors such resentment toward his ex. I would think that has to come out no matter how hard he tries to suppress it. Maybe you have one of those opportunities to show him you are not his ex and he shouldn’t keep treating you as if you were…. one of this difficult, touchy but potentially important opportunities like Hairdog and Chrome may have.
Then again, I expect you have already tried to address this, so maybe I’m not giving you any new ideas.