I dumped my boyfriend after he admitted he was polyamorous
So you don't think polyamory is a legitimate life choice?
Yes it is but I am not into it.
While you are entitled to your views, others are too. That being said, dating someone with similar views on this type of thing is important to a happy relationship.
Maybe in the future I'll be able to accept it. Polyamory is probably for sluts.
If you want to be monogamous you don't need to force yourself to be ok with this. You can find someone you are compatible with.