It could be the case that they got complacent together, they had the house so they didn’t have a next step eg. A house to themselves, engagement or babies. Maybe there was no “spark”, they may still love each other and like Zeliha says they still are best friends, good terms and she mentions that if they do get back together not to be surprised. To me it doesn’t seem like a bitter breakup but more of a “I love you but this isn’t working”. I hope this makes sense hahaha