To be honest, It's appropriate that they didn't get together. the FeMC got scarred by her past life thinking the MC turned against her. She did those creepy things out of revenge and found out the MC was not even with the "bullies", imagine the guilt she felt after that.
And the MC found out that he was being toyed around emotionally, you can't just shake that off. Some of you guys might disagree but I think this is a responsible move for both MCs. You can't just get in a relationship with someone especially right after you find out that the person was manipulating you mentally, would there still be trust after that?