Perhaps to you. To others, monogamy in a romantic relationship is a requirement and a reasonable expectation.

Couples should figure out where they stand on that, before they resort to kicking.

It may well be that someone has a reasonable expectation of monogamy, but that's entirely irrelevant. If you don't like the way your partner acts in a relationship, you don't hit them, you talk about it and possibly break it off.

Whether or not monogamy is a gift or an entitlement depends entirely on your culture / value system. I think that abusing someone's trust is, well, abusive.

> I think that abusing someone's trust is, well, abusive.

She seemed to be straight up honest about that fact she didn't want a monogamous relationship, where is the abuse of trust in that?

You have never been in a deep relationship before have you?