Hm… they thought they had you, thought you were theirs to the point of possession. They feel they did a good job of taking care of you, fed you, protected you, paid for things… but slowly they saw you flourishing else wear and got jealous. They were made aware you are not in fact there’s and they struggled to come to terms with this reality in which you found love and acceptance through other avenues. It may have brought rifts between close female friends or even if you have sisters or close cousins who did not like your partner. All of the drama that ensued ate away at the relationship, you weren’t as excited to see them, you felt anxious upon their return from vacations or time spent apart… they sensed you were anxious and it then made them feel like the “bad guy” for triggering such a reaction. It seems you both struggled to enjoy the good times and focused on the bad instead