Jealous of best friend's boyfriend..?

I'm not jealous of the act that she has a boyfriend and i don't..honestly, i don't are about boyfriends. he's a really nice and sweet guy, but i see him as a friend, nothing more, but when i see them kiss or snuggle i feel something deep and heavy in my heart, as i wish that they would cut it out. a few days ago i called her and asked if i could come over to her house, since i was bored, but she said no, since her mom wasn't home, but in the background i heard her boyfriend talking. it made me very angry that her mother wouldn't trust me, a girl, but she would trust her boyfriend alone with her in the house. i hate this feeling, i used to not feel like this, but as their relationship grew, my anger grew, and now i see love as a waste, for the weak. it pisses me off when i hear about her saying "he's the one" and when they talk about getting married or having kids... i hate it!!! but i hate this feeling, please, can anyone tell me what to do so i don't feel this way anymore?