I agree that the whole situation was manipulated - that is how the producers run it, for ratings, and we're complicit, unfortunately. Everyone wants the drama. It puts people under huge pressure and brings out the worst in some. I can't see it lasting much longer in this format.
Your comment made me think though
"He shouldn't have told Amber to sit down, but" I don't think there can be a 'but' there - that was horrible to witness, and experience for her I'm sure (not saying this is abuse, but behaviour that is a red flag).
"you could see how wound up he was and the pressure has clearly got to him. I thought when he told her he wasn't interested he kept himself under control and it was the right thing to do."
This is a really important part of why his behaviour is so alarming. Amber did nothing wrong. Michael had no business trying to speak to her if he was visibly struggling to control himself. I think that was one of the most unsettling aspects of it - and why it seems like Michael is taking this out, so unfairly, on Amber. She's clearly found it very hard to cope with that attitude and was understandably shaken.