OK...now you forced me into therapy mode..... Yes you are hurt. I'd imagine your daughter did not move in with this fellow to hurt you....she just may love this guy and he may become your son-in-law...so give it time. She "is" an adult...even though you are still providing some support. In time you may be hunting with the man living with your daughter....so...don't inflick wounds that may never heal.
He may be in a hunting blind near you...GRIN.
I think your heart is in the right place.