My observation is that almost all relationships ended by women no matter how she ended it, where already trash for a long time.
Women end the majority of relationships. There are many well known stats that women are the ones who file for divorce to end marriages.
In non-marital relationships, women end those more often than men end those. The gap isn't as large as women ending marriages though.
Women are also usually the ones ending interactions after 1-2 dates. The "1-2 date, no sex, no extended relationship" interaction is usually ended by a woman, either by ghosting/flaking or a "I had a good time on our date(s), but do not see this going anywhere" text message.
With extended relationships, they often tend to fall apart more slowly than most outside observers would think that they would. The process of de-coupling takes longer than it probably should. This is more true in marriages (especially marriages with children) than non-marital relationships. However, non-marital relationships do often last longer than they should.
In marriages, the "trash phase" lasts longer than it should because people feel obligated to keep it going for a variety of reasons. Some people keep it going longer for the sake of the children (but will usually divorce before the children turn 18), some people will engage in marriage counseling for something like 6-12 months to try to save it. Marriage counseling usually doesn't fix a marriage and just postpones the inevitable divorce. I also think that people often hesitate to start a divorce process because it's a pain to deal with the logistics of it. There are a variety of legal implications and then practical implications like finding a new place to live (for at least one person), finding a new sexual partner (for both), etc.
Non-marital relationships without children are easier to end. The "trash phase" doesn't tend to last as long as a result. Non-marital relationships often have a "trash phase" but the practicalities of de-coupling are often easier. If the two people aren't living together, no one has to find a new place to live. If the coupling is living together, at least one person will need to find a new place to live. There can be complexities with owned real estate and even rented real estate. With renters, a non-marital couple might decide the end the romantic relationship at the end of the lease.
I can't cover every situation in this post but I think this is a good start on commentary.
You know who has it good? People who met in highschool and got married and stayed together. They now have children and they don't need anything else.
There's something to be said for people who meet in high school and college (before ages 22-23 -- typical college graduation ages). They get together young and have the potential to grow well together. It can be a near ideal situation to meet someone in high school or college and have a decades long relationships.
There are also couples who form in high school/college, get married, have children and eventually divorce in their 30s/40s too.
It is interesting to compare couples who form in high school/college to couples who form at age 30 and beyond. When longer term committed couples form at age 30+, they tend to bring more baggage into a relationship. Even in situations when 2 childless 30/40 somethings get together, it does often resemble an awkward corporate merger. The two people had long lives independent of each other. They didn't really grow together like the high school/college formed couple. The same magic isn't there.
There are often couples forming at age 30+ starting new committed relationships with past failed marriages and children from past failed marriages / past failed relationships. Merging households and merging children under 18 together is messy.
Another unpleasant situation occurs when two people 50+ with adult children form a new relationship. Although that's less messy than getting together in one's 30s-40s typically with younger children, coupling up as older adults with young adult children causes friction. The adult children typically aren't enthusiastic about their parent's new partner, even if they are cordial to them. The two sets of adult children usually don't enjoy spending holidays with each other either. Another thing that might happen is that one partner's adult child has employment/financial issues and might need to move in with a parent in their 20s-early 30s. That can cause issues as well for the 50+ couple that lived almost all their lives apart from each other.
