I have this tendency to let things stack up until I just orbital nuke my relationships with people. It’s not my best trait admittedly.
Never thought I'd see something like this in the wild (because it's painfully relatable).
I attribute some of it to attachment issues in my case, that some part of me wants to distance myself because of anxiety no matter how it's going, so if I also have an excuse to distance myself, my brain latches onto that hard. But sometimes I do have legit issues too. Sometimes even, I'm flummoxed that others are seemingly ignoring issues that I consider a problem and are sticking around regardless.
I guess the healthy thing would be to bring things up immediately and try to resolve them before resentment builds. But sometimes that's hard to do in the moment.