<human>: Condense the text into a few key points

Okay, so there is a girl [16] that I've known for over 5 years now that I really enjoy being around with. Freshman year in Highschool, I finally recognized my feeling for her. Sadly, one of my closest friends [16] told me he liked her, so I kinda backed down.

Skip a year, he's now dating her. I'm happy for them and all that, but as I become more "involved" in their relationship (from talking to them and hanging out with them I gather information type of thing), he is being a bit of a degrading dick.

My friend is the kind of guy who wants a girlfriend for physical contact and thinks that by waiting it out, he'll eventually get to 3rd base or more. Every time we hang out he talks about making out or trying to grope her. It gets annoying and I think that it's wrong to talk like that and have that mindset in a relationship.

I'm the kind of person who doesn't jump to people and really evaluates a person and gets to know them before wanting to date them. The girl and I are really close and have so many common interests it's ridiculous; political, religious, colleges, music, video games, etc. She even jokes about us being "soul mates" and we both have nicknames for each other. 

Recently, myself and two friends were having a sleepover (one being the dater) and the friends were messing around with the interest over text. She got mad because of the sexual stuff they were saying, which  I thought was wrong, and then he called her apologizing and blaming it on me and the other friend (half of which is true). I told her the truth later. Was that wrong of me?

The thing is, my close friend will just move on to other girls because he has even thought about leaving my interest for another girl. That makes me believe that he is using her as a safety net since she is his make out buddy basically.

What do I do in this kind of situation? Wait it out? :(
Thanks!
<bot>: Close friend [16] is dating the girl [16]I like and he's kinda a scumbag to her and can/will leave her if he gets bored.