went through pretty much exactly the same nearly 2 years back (well, the last part of your story obviously)....

only to add onto mine, 2 weeks after I found out why it had happened...........for a married man 16 years older than her, who's she's still seeing, and who's STILL with his wife after constantly promising to leave her......

you won't wanna hear it, but you ARE BETTER OFF ........ it's took me all this time to realise it, and believe me, it still hurts, especially when the the cunt has he grubby hands on my daughter.......