As a mother and a daughter and someone who fell out of love with her husband, who then committed suicide when I said I fell for someone else. My parents loved my husband as a golden son.

When I brought the boyfriend home....my parents welcomed him as a person who I loved and who stopped me from killing myself.

You....need to do the same....he is a man who is giving her time. He may not be the forever person for her...especially if she ultimately wants babies. Be cordial, be polite. He is giving her something....a knowing of how lust vs loves feels.

It is your daughters journey...let her live it without condemnation. Just be there for her.....she will sort it out in her own time.