>>3 Yes online can be painful just as much as real life apart from the fact that there were no physical ties.

Personally i believe that you should just move on, its always good to try and find the original reason behind this but i can probably say safely that your not going to get a straight answer, not if you were treated like this from the beginning. Just take this experience and use it towards your next relationship. Its always better to move forward instead of dwelling in the past trying to find out the reason for it ending.