My Boyfriend's Dad

I gave her a job to be nice.  She was the perfect fit for my company. I had no idea she’d be the perfect fit for me.  Every day we spend together, it gets harder to say goodnight.  I can’t touch her. She’s twenty-four and I’m forty-nine. And she’s my son’s girlfriend.  But he’s not treating her right. And I know I would.  She just asked me what she should do about their relationship.  What am I going to tell her?