My guess is that you don't treat yourSELF very well .. ba<x>sed on your sign in name, so that could be a signal to somebody to treat you badly...whether you go out again should depend on whether you want that same treatment.
If they have changed, then yes. If they haven't, then no.
it depends on how he treats you in the present. you never know if he already changed for real :)
No. Why in the world would you do that?