I'll start by saying that I agree that Mike isn't perfect but disagree that he's a terrible person. He's choosing to protect his ego instead of acquiescing, but I don't think he's under any delusions that everybody will stick with him no matter what he does.
All they have to do is not bring up Sandy and not steal his shit and the majority of his outbursts no longer have a cause. This is the second time I can remember off the top of my head that he entered a situation upset because he felt like he was losing his friends to Lucy but the conversation was immediately twisted into being about Sandy, further upsetting him. His friends don't really think about why exactly he's clinging to her so hard, they just treat him like a dipshit for not having it solved already. Honestly they just don't respect him as a person. Mike seems to be aware of this and it's stopping him from opening up fully about what bothers him, which makes everyone else stick to the Sandy scapegoat.>>108459719
He's level headed in that he's able to stay calmer than most, but he's not a nice enough person to do something like that.