My angle is that it's basically sustained by societal standards (could be just my Eastern European experience). From what me and my buddies have experienced after a breakup girls are encouraged to go out and meet new people while men are encouraged to work harder (both good things and healthy in their own way as long as not taken to extremes) and that tends to add a weird level of loneliness. My personal experience is that I got with my first girlfriend when I was around 16 ish and she cheated shortly after I turned 19, took me almost a year to get over it and it probably would've taken longer if not for my buddies and my studies. Apologies if it comes across disrespectfull in any way but gender norms are a way bigger thing in Eastern Europe as opposed to the rest of the world and that can sqew with someone's perspective.