send them a message and let them know that , that was not your intention
awwww....that's to bad. maybe he will come back !
When that happened to me I PM'd one of her friends and explained the situation and she eventually unblocked me and we became friends again but here at EP this is probably the exception rather than the rule. I have been blocked for the stupidest reasons. I just move on.
Apologize and let them know that was not your intent.
Ask them if you did and apologise?
Being as you are not even sure what you did to upset him I'd say his behaviour was very childish. I wouldn't worry too much about it though as from my observations these guys usually come creeping back again. You could try sending an apology via a friend but really if he's not willing to even discuss it I'd say he's the one who needs to apologise most for being so rude. Try ignoring him for a few days and see what happens.
The fact that you were concerned about his feelings and willing to put things right shows what a lovely person he's turned his back on. :)
Tell them you're sorry ..
Not much else you can do. It happens.
When we only have "words" to communicate with on here .. things get misunderstood.
ask them outright if you did
never mind, most people know your a good person here :-)
go talk to them