Love, depression, and life

As of today, its me and my boyfriends two years of being together. It hasn't been awful. I lost my virginity to him, and Im invested in only him. He moved over the summer, now hes going to a new school, and hes three hours away. Being the new kid, he zei a ton of girls flirt with him. I understood. I don't know these girls and if he plans to do anything with them. On Monday, he decides to tell me about these two girls. He doesn't talk to them, nor does he know their names. So he tells me... "The one girl has great les and a nice ass. And the other one has nice long brown straight hair." Being as insecure as I am, he still tells me. Without any thought. He never says these things to me. Then he calls me and says he goes for personality. Then why was he attracted to these girls? He plays it off as an accident. Then he says he realizes he messed up. Yet, I find myself comparing these girls I don't even know to myself. But I thrive to be his idea of perfection. It doesn't help I have severe depression. My racing thoughts get in the way of everyday life. My emotions are crazy and I cant deal. I cant break up with him, nor could I take a break. He is the only one I want in life. But I cant tolerate him looking at other girls. Then wondering when we spend time together is he thinking of them. I don't like to belittle myself in situations like this. But can I believe him? Is he just being a man? of is he just thinking with his eyes and not his brain?