Does this make a good man also an immoral one?

This woman sounds like she is a much better Christian than you are.

You would be smart to get her to marry you, if she would be willing.

And in the mean time, try very hard not to screw things up even more.

Hebrews 13:4 "Marriage is honorable in all and the bed undefiled but whoremongers and adulterers God will judge."

Also read 1 Corinthians chapters 5,6,7,10 for such admonition as "Flee fornication."; "now the body is not for fornication", and " to avoid fornication let every man have his own wife.", etc. It sounds like this is a lady who is choice, virtuous, and worthy of respect and admiration. Maybe you need to get a better understanding of God.

Sounds more like she's manipulating you. An immoral man would chase after kids for his jollies. Living with a woman out of wedlock is no big deal, especially if you keep your hands off each other.