I'm not going to leave my buddies house
Why are you not leaving his house? Did he ask you to leave?
I'm someone who will stay in my buddy's house when he is sad
It is great to be there for your friends but you have to make sure that you don't overstay your welcome when you are at another person's house. They might feel uncomfortable telling you to go.
Screw them if they hate my company. I'm happy
It is not a good idea to overstay your welcome somewhere. Your friends are probably too polite to really tell you how they feel.