i need some women to women advice Pleasse.

my sons biological father, my ex whom i lost my vcard to, who i was with for almost 7yrs has bought a house and, wants his family back. I have been dating this other guy my current bf for 7mon... he has never treated me bad, has only showed me uncondotional love. where as my sons dad has abused me, cheated on me, left me for a bitch i thoight was my rider... not to mention got me strung out... so my question is. why is it that as Soon as my sons dad wants me back, im willing to give up a wonderful, rare Man....?