<human>: Can you condense the text into a few key points?

To start off, I'd like to say thank anyone for any help they could offer. That being said I have known [m/21] for four to five months since I transferred to a new university. We hit it off very quickly, and soon become good friends who get together on a daily basis. We share similar ambitions and a perception of the world, we even love watching Japanese anime, reading similar books, playing the same type of games, and writing stories. (Just in case: He's a top, and I'm a bottom)

The issue is he is currently dating another guy, who is a decent gentleman but he cause many issues. When I stepped into the picture their relationship was rocky because the boyfriend (26 year old) likes to accuse my friend of cheating. The only reason he does this is because he looks to keep the relationship entertaining by adding a touch of drama. He's also tried pushing my friend away from everyone else (including me).

Now my friend and I did spend a night cuddling and feeling each other up, which lead to his boyfriend hating me. A week later I told my friend(m/21) that I liked him. He was honored but wasn't ready to give up on the current relationship. My friend is also an extreme tease, always sitting on my lap or cuddling up to me, causing me to go crazy and my feelings to grow. 

After having him over my house recently (where we ended up falling asleep in each other's arms), I had a party the following day. It went smooth until his boyfriend also came. They were hanging on each other the entire night, until I found them taking a shower together (party was at my house and my parents were home). They didn't have sex in my shower (sure of that) but I just felt so defeated. Knowing that regardless of how much his boyfriend hurts him and how much I try to make my friend smile, him continuing to stay with him pains me. Its even worse when he still continues to tease me and he knows I have feelings for him.
So reddit, if anyone would like to help a hopeless romantic, I'd appreciate any advise you have to offer. Thanks in advance <3
<bot>: I like my close friend. He is with another guy who treats him horribly, while I try to make the time we spend together the best for him.