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

I know this is selfish of me, and I've tried not feeling this way but I can't. I honestly don't care that he likes other girls, it's not like I'm trying to pursue a romantic relationship with him. I encourage him and give him advice all the time with his pursuits of girls. 

It's just this girl. I won't go into too much detail but she's rude, jealous, vindictive, disrespectful, and selfish. 

I want him to be happy, but he often comes to me with their troubles and he often ends up hurt. 

I don't know what to do, I really want him to stop associating with her. I know that's selfish of me and I don't expect it to happen. I'm trying not to want that. 

I try to understand why he likes her, she's a truly physically beautiful girl, and she has a crude sense of humor that he appreciates. 

Ultimately, I want him to be happy, but it's hard for me to see how he could be the most happy possible with her. 

Please give me advice on what to do. Intruding on their relationship is out of the question. What I guess I'm really asking is how to deal with it. Writing this is making me cry so I won't go on for now.
<bot>: best friend likes and cares for a girl that I think isn't good for him and it hurts me. It's not that he likes other girls, it's that he likes *this* girl.