<human>: Can you condense the text into three sentences or less?

My girlfriend of about three weeks now used to make me really happy. It's a long distance relationship, and we skype all the time and it was great. But recently I've found myself getting more and more aggravated with the ordeal. 

She always assumes the worst if I don't message back right away and always thinks I'm mad at her or something. I've tried telling her that if I had a legitimate problem, I would talk to her about it, but she carries on either way. Plus, she gets sad very often and her happiness seems very dependent on me, which doesn't seem healthy. 

To top it all off, I'm not even sure if I really want a relationship anymore (I fear that I mixed up platonic feelings with romantic feelings), but the last thing I want to do is hurt her.
<bot>: My girlfriend's happiness seems to be dependent on me alone, and I don't even know if my feelings are truly romantic.