if she will dump her old man to be with you ..eventually she will do the same to you ..as far as the screwin part goes..if she cant give decent head and isnt willing to learn id move along ..but thats just me ..it's hard to be with a girl if there is no chemistry ..i had a simular thing with my oldest sons mom .. the sex was only ok but we still have way strong love for each other ..and now that we are just friends we can hang out and party together..it's nice to be able to sleep with who ever you want but still have some one that you know will love you and be there for you when you need it .. i hope things work out for you dude ..