There's an older man who I am in love with, but he's already taken.
Would you give up a relationship for him?
I would if it meant getting rid of her.
You can't help if you're attracted to someone. But don't go after someone who's got a partner.
He can't help but get him self in a relationship with a jerk like her.
You don't know if she is a jerk, and if he's with her instead of you then that must mean that he loves her. You should accept that and find someone that doesn't have a partner already.