why did i get banned

i was walking and got banned for some reason ?

It sounds like you were given a temp ban for doing minor griefing in lots of places. Let this be a warning to you .... don't mess with other people's things. Don't destroy glass. If you break into someone's house patch it up when you leave.

i dont remember griefing into any houses or griefing at all

That's why we have BigBrother. It remembers things and puts them in a log. It knows what you have done, accidentally or otherwise. Your ban ends tomorrow.