<human>: Can you summarize the given text in a few sentences?

I'm very confused right now, about all of this.

i have been friends with Michael for 5 years now and he is a really great friend.  me and him have had sleepovers, we share everything with each other and know each other's secrets.

so a little while ago Michael confessed, he had feelings for me but i had feelings for another guy (who is now my boyfriend). i told him very gently that i don't feel the same way.

it's been 4 months since than and he's doing better and has even found a girlfriend. now i didn't know it until i saw him and her going to the movies together.

she is really pretty and seems to really care about him a lot from what i have seen. it's just that everytime i see them i can't help but feel slightly jealous of her.

my boyfriends friends talk about how attractive, she is and are always talking about her butt. i asked my boyfriend if he found her attractive and he said only a little but not very much.

she gets good grades, is always nice and on top of all that she looks like a model. i don't like it when her and Michael kiss for some reason it makes me really angry.

i know all of this is irrational so I'm asking how can i make it stop?
<bot>: I'm jealous of my friends girlfriend and don't know why since I'm in a relationship as well. help me?