In a relationship, what are your limits?

We can do a lot of things for our SO, put up with some weird habits, tolerate their bad behaviour etc.
But what is that defining limit that makes you go "Nope, I'm not standing for that. This relationship needs to end."?
It could be anything, from him/her cheating to him/her being rude and disrespectful to your family, abusive behaviour or even extreme body odor which just drives you nuts.
It would be interesting to know all of your opinions.

In a relationship, what are your limits?
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