DS's dad told me today that he has a new girlfriend and it's made me feel shitty which has come as a surprise as I never thought I'd care 
We split when I found out he cheated on me while I was pregnant and to be honest he was a shit boyfriend at times and not a brilliant father.
We stayed reasonably good friends after the split and we really do get on and I kind of saw him as a best friend for a while. We also had a bit of a friends with benefits arrangement for a while after we split and it worked well, then it fizzled out and things had been a bit awkward between us for a few months as he changed.
However he asked if I would get back with him less than a week ago then today he tells me he has a girlfriend!
I made the stupid mistake of searching for her on facebook and she's better looking than I am and I feel like a fat old model that he's traded in.
I get upset because although I love my life and wouldn't change it at all, he has no responsibility, he lives at home and is virtually child free, he is a dad but not a parent in any way.
He cheated on me so I was made a single parent to a 3 week old baby through no choice of my own and although I'm very happy it still makes me burn with anger that he can do whatever he wants whenever he wants and now he has a new girlfriend and I'm raising our 1 year old son for him while he does what he wants and doesn't contribute.
I think a big problem is that I'm having problems with body image. I feel disgusting and hate to see the way my body looks especially after pregnancy 
I feel silly for being jealous and feeling hurt because I wouldn't have him if I could.
I suppose my issues are to do with my body more than anything and this has just made it worse 
I shouldn't feel jealous because he treat me awfully at times but then on the other hand I worry he'll treat her amazingly and bother to get a better job and learn to drive even though he promised me that for over a year.
I suppose I'm scared DS will become even less of a interest to him and he'll turn into an amazing boyfriend for her like he never did for me.
The sensible part of me says why on earth would I ever want him back, she's more than welcome to him.
Then the stupid side imagines them happy together and his family welcoming her in, when it's me who was cheated on and neglected.
I'm sorry if this all sounds pathetic but I'm feeling awful at the moment 