Speaking of what you can and can’t stand in relationship, this is personal. I once dated someone who could not stand the way my voice carries when I talk.
I can’t stand passive aggressive, so I married an aggressive man.
Some people can’t stand an inflated ego, and/or preachiness. Others don’t mind it.
Some people like to spar in their relationships, others hate upset of any kind.
The key is to decide for yourself what you can and can’t stand. Boundaries, see?
For the outsider looking in, just because you can’t stand a person, doesn’t mean your friend is having a problem.
What is deal-breaker for you in relationship? Also, can you think of something about your partner that bothers other but that you enjoy?