is it unreasonable for me to want to be the only girl in his following list ?

i don’t want to keep comparing myself to other girls , with my ex this was a huge trauma of mine because i hated seeing him follow other girls that looked nothing like me . it hurts because sometimes i don’t even know whether he’s in communication with these girls or not . in the past i has to message girls who he was following to ask if they talked , i feel pissed off just thinking about it . do i have some kind of issues ?