Lol. Love is complicated, you can love someone and know that you can't be with them either. Plenty of people get married and then divorced, doesn't mean they didn't love each other to their fullest extent. Stuff happen, life is hard, not everyone ends up traveling the relationship road in parallel lines.
Also we don't really know what issues they had, princess paahfect always staged a happy life to show everyone but as time passed you could clearly see the strain on his face, he was getting more and more distant from her. It's like he was practicing social distancing before Covid even hit. I think in the end he just knew that it wasn't going to work.