I imagine in mono relationships, the reason people put up with a lot more shit could be to do with a fear of being alone or something, whereas when you have many realtionships, you feel that you'll still have the love and support when you cut away from the things that aren't going so well. I think that is one of the problems of being mono, rather than being poly. You should look at it as a good thing, that you got out of something you weren't happy with.
But it also depends how sever something is, as to whether it could be the right or wrong move. Ask yourself if it is something you can work through or if it is something you just cannot live with at all. That should give you the answer on what to do every time.
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