I agree with Doyoutrustme above. The man is the one who is getting what he wants out of this relationship. Especially if he never marries her. Dating is not serious until it gets long term. Long term is not beneficial to a young woman who has not had the advantage of time and varying partners as her 45 yr old bf has had. If she wants children, that may be another blow to her if the 45 yr old has his own grown children and is not planning on any more. This is a losing situation for the woman, even though she may not see it that way. 20 is a tender young age. I just see this as a man taking advantage in the long run. Sometimes a relationship like this just has to run its course. Both people have to exhaust their deep rooted needs until reality sets in, and eventually it will.