Toxic Friend?

I’ve been best friends with this boy for a little bit over a year now. I’d consider him my closest friend, but lately almost every thing he does bothers me. When I confront him about the things I don’t appreciate he does (he’ll complain about me to his friends for things like not always wanting to hang out with him) I feel like he doesn’t listen to me. I’ll tell him I can’t make plans a day in advance, yet every week he’ll try to make last minute plans. Also, one of his friends doesn’t like me so I told him I don’t want to hear many things about her, but then he’ll continue to tell stories about her and some of them are about her feelings towards me which are not good ones. He’s been making me feel really upset and stressed out. I don’t know if I’m over reacting, but I haven’t been wanting to be around him lately.

Any tips on how to get over the bad things your best friend does for the sake of your friendship?