<human>: I live in an apartment with my best friend and her boyfriend. We see eachother all the time but we never really go out and do anything anymore, which is understandable considering that she has a boyfriend now. But when we do hangout at home, all she does is complain that her bf is controlling, doesn't want her to spend her money and doesn't want her to go out until he gets home. And then he complains that she spends too much time with me, so I'm hardly included when they go out. I complained about it to her and she accused me of wanting all of her time and being jealous etc. 

They got engaged a few months ago, and at first she was all excited and wanted to show off how happy she was, but now they don't even talk about it and she just complains that she doesn't want to get divorced and doesn't want to be tied down and he's not the one. But they're still engaged and she still pretends everything is fine and dandy because she's "comfortable." They've broken up and got back together so many times, it just gets annoying to hear it when I know she's just gonna pretend it never happens.

What pisses me off the most is that she's changed a lot since they got together. She was always fun and energetic and the life of the party but now she's always moody and bitchy and anxious. She never seems happy anymore but when I point it out I get labeled as the bad guy.

I try to be supportive even though I'd love to tell her to break up and move on. What should I do? should I just stay out of it and mind my own business and let her make her own bed and lay in it, or should I convince her to change?

Can you give me a shortened version of the text?
<bot>: Sick of dealing with my moody and unhappy best friend, don't know if I should try to change her or just move on with my life.