The only problem with loving someone comes when they don't feel the same. I would imagine that with all he had going on your companionship was needed by him, but when the dust settled, he realized that being free was what he really wanted.
It happens all the time, and hurts like hell when we are faced with the reality that the love we have is not returned.
This doesn't have to be a bad thing, painful YES, without a doubt, but now you can heal, and look forward.