The Unexpected Pregnancy Book

Hero was a cad!
He had unprotected sex with heroine yet his first reaction to her pregnancy is "is it mine?"
And he claims to be totally head over heels in love with her.
There was NO indication of marriage, in fact he said it in plain English, he loves her, forever, but no marriage. Suddenly after the pregnancy he's all pro marriage. So forgive me if I don't believe he didn't marry her for the kid after seeing exactly HOW strong she is, and how she loathes when he's all alpha and presumes his control over her. She has walked out on him for that behaviour once before. She was ready to do it again. Marriage was his only option!