Would you be jealous if.......?

I would definitely not want him calling me something he calls his ex. That is not cool at all. If it bothers you that much, you should tell him...Although he might question why you're looking into his comments.... I would just ask him something like "Am I the only one you call that?"... and just make it seem like you used to date this guy before that would call you by his ex'es name or something... Good luck!