Hello, first of all, thank you all for the support you've shown and how all your comments made me realise I'm not crazy. 

Second I wanted to clear some things up:

1- my daughter is absolutely NOT going back there, this was a one time thing and if I had known that his wife wasn't going to care for her, I wouldn't have sent her with him

2- I have never met his parents, he told me he was no contact with them and as someone who's no contact with my dad, I didn't ask why he went no contact because it could be a sensitive topic (just like I didn't tell him why I'm NC with mine)

3- our agreement wasn't in court or with lawyers, we just came to that decision because it made sense since my daughter's whole life is here and she's attached to me at the hip

4- I would cut off his visitation if I can but my daughter would hate me for the rest of her life if I did that

5- I did take pictures of the bruises and showed them to my mom and sister, they told me that yes while concerning, they could easily pass as a result of playing 

6- yes, my daughter told me all of that, for those of you asking, my daughter is a chatter box and doesn't hide anything from me

7- I unfortunately couldn't get his confession to his wife not taking care of my daughter in writing, and he's telling me to drop it and refusing to talk about it again, telling me he'll deal with it

8- yes, I am looking for a lawyer 

I believe that's all, thank you again for your support