Bf scared to have female friends

A while back I caught my boyfriend sending freaky text msgs to his female friend whom he consider to be like "one of the guys " . We broke up got back together blah blah ... now he says he feels weird about texting/checking on some of his female friends whom he had completely innocent friendship with. I never told him he couldn't have female friends I just told him I'm not going to be down with the constant texting females all the time (keeping them entertained) and being disrespectful towards are relationship. He says he feel isolated cause he has no one to talk to. lol weird huh? Don't know what to make of it.