What is he doing with her? Is this going to last?

Alright, here it is...my ex and I have been broke up for 6 months after a 9 year relationship...we work at the same place...2 months after we broke up he started talking to a girl that also works with us...she is so not his type...trust me I know him after 9 years so that's why I am confused...she is 6 years younger than him, she has 2 kids (5 and 2) and he doesn't want kids, she is extremely skinny (which he thinks is gross), she is still legally married, she has several past court cases as well as a few current ones, she has several "jail house" tats, she slept with another co-worker of ours, she recently lost her license, she basically doesn't have a pot to p*ss in and nothing to offer him, oh and he is her boss at work...what is the deal...this chick is completely wrong for him and he is the joke of the century at work...they think they are slick by trying to keep it a secret but everyone knows...what is he doing and does anyone think this is going to last
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oh and she has said several times that he is not her type...she likes the bad boy types with the tats and piercings...well he is definitely not that...he is clean cut without a bad bone in his body...


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He has also made several comments about her to me that were awful mean to say about someone you have a thing for such as, she is trash, she is gross, and her kids look dirty...that was probably said to just throw me off the trail but damn...
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I DO WANT HIM BACK! I spent almost my entire adult life with this guy and we had a pretty good life together so I thought...we bought a house, we had (have) great jobs, 2 dogs, nice vehicles, a great sex life...what the hell? Then he picks her?
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well today is my birthday and guess where he was...at the nasty whore's house...great birthday present...
What is he doing with her? Is this going to last?
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