For that matter, what do you love about her?
I've heard her story over and over again on talk shows, love a guy, have unprotected sex, have kid (unplanned and unmarried), he cheats while she is pregnant, she leaves, she wants him back when he gets a new woman, she uses his kid as a way to manipulate him into getting back with her.

Think about it...
She is with a dude who treats her like shit and everyone can see it
but she loves him anyway
She has unprotected sex with this same man
and she gets pregnant
She finally leaves him
but only when it is so bad that even she has to see it's no good.
She has his child
then doesn't let him see the child because of her grudge.
She feels like she loves him again now
though he has another girlfriend and their past is not pleasant.

a series of really really bad decisions that she is currently forcing her brand new child into as well.

Now try this

Guy meets chick
he doesn't like her that much but keeps her around for some reason
(you dont treat people you like badly)
chick he doesn't like all that much gets pregnant with his kid
he has no choice now but to deal with this chick he doesn't like all that much
for the rest of his life, she forced him into that.
Of course he cheats on her while she is pregnant,
he definatly doesn't want a kid, barely likes her
and probably only kept her around for sex to begin with
so once she couldn't put out....he found another hole to stick it in.
she leaves him and then refuses to let him see his own child
for some stupid ass reasons of her own.
When he gets another girly he actually likes
the old one keeps coming around and using the kid as a bargaining chip to get back in his life and bed.
well he didn't like her all that much to begin with
and he didn't want a child with her
despite her not wanting him to see the kid ever...
she brings baby over when the new girlfriend is due to arrive shortly
and then everyone gets pissed off when he doesn't put his life on hold
to spend time with the girl he doesn't like
and the kid he didn't want.

chick is using the kid to get to him, and that is not fucking cool.