I'm going to say my dad wasn't there for me
and do you think that was the case?
I can't really tell because something bad happened between us
I wouldn't make claims on anything if you're not certain. It's not cool to tear your dad's character down based on assumptions.
I can't really tell. My dad did something bad to me but I don't remember what it is.
If you're so unsure about it, you should dig a bit deeper about it. Ask your mom or other family members what exactly your dad did. It's not nice to call your own dad bad if you're not sure.