there was a man here on pc that was similar and he had a LOT of different issues. and was manipulative and angry as well. he would say one thing personally to me but did the same thing, posted his 'true love' for someone else in the public forums. bipolar was just one of many things he dealt with. the thing is, I have bipolar as well and people who know me love me to death. I am kind, helpful, I rarely get angry, I don't manipulate. I get sad, I get anxious, I get euphoric...I don't get hurtful or mean. So the bipolar doesn't let a person get away with bad behavior. just because you have a mental illness doesn't give license to be evil and hurt people on purpose. that is a totally different thing.
you need to get away from this man, not too hard since you are blocking each other and only talk online. and understand, that the majority of what you are feeling for him is in your head. I am so guilty of this too, my imagination is way better than the reality of whatever relationship I am in.