I think it's ludicrous to suggest Curtis was acting like he was in love with Amy, blimey we have many threads on here talking about how he clearly wasn't feeling it. I personally predicted many threads ago he would end it, and we were all joking how he treated her like an elderly aunt.
Gender isn't relevant, sometimes a woman is wrong. Sometimes a man is. Amy took this for far more than it was, and he did right to end it. She was talking like she was spending the rest of her life with this man. And at no stage did he get down on one knee.
When he tells her kindly but straight she accuses him of being nasty.
He simply hooked up with the wrong person, because unless he committed to marry her and have babies, he was always going to be fucked by her. No two ways about it.
Apparantly they had to bring in a therapist just to help her through it. She was that into believing she had no future without this man.