feeling inferior

my boyfriend and I have been together for going on ten months, when we first started dating he told me that he was still friends with one of his ex girlfriends that he went to high school with just to make sure that it was clear they're just friends and I was ok with it because his last girlfriend didn't like the idea of him being friendly with other girls period but that's a different story. They don't talk often, there's usually months between their conversations, and I do trust him I promise that with every bone in my body I trust this boy not to do anything behind my back, but I can't help feeling inferior. It may not sound like it makes sense but I'm ok with him being friends with whoever he wants I just feel like I can't compete where I don't compare. she's so pretty and she was his first love, I know he'd never go back to her because she cheated on him plus he takes our relationship so seriously and he reminds me everyday, I just don't know how to compete with the first everything. I'm pretty sure she's putting him in contact with a friend for business reasons and because of that they've been talking recently and I feel like EVERY TIME I'm with him lately she calls, I'd be fine if it were like here and there but it feels like it's every time, maybe because since I'm in school I see him less so it just feels that way. if it makes sense every time she calls I ask if he's going to answer he indifferently says no, he has no interest in answering, but I just feel like if I were him I'd want to answer. I feel like she's better than me, maybe there isn't but I feel like they must have some sort of connection I can't do anything about. I don't want to tell him who his friends can and can't be, but I don't want to feel like I'm coming in second place when he makes it clear I'm his first and only priority.