I am worried

I have a friend let's call him Paul and he is gay we have been friends since we were kids. He is a great guy everyone loves him but recently he has a new boyfriend. Now this guy lets call him mike is someone that everyone knows is kind of a asshole I won't go into full details but he is the worst. I think that there might be some kind of abuse going on what I mean is this me and Paul recently had a conversation just talking and out of nowhere Paul chokes up and tells me that his boyfriend wants him to have a sex change. I got confused and I told him if he doesn't want to do that then he dosent have to and Paul says he knows that but he is really in love with mike and dose not want to lose him. I asked him why dose Mike want him to do that and he tells me that it's because Mike wants him Paul to look nice and it would make him happy if he did that but Paul really dose not want to. He apparently smiles at Mike and says that he would think about it but Mike apparently has been getting more and more persistent. I'm worried about my friend what should I do I personally think that he should break things off with Mike because it's just really fucked up.