He thinks H might be feeling differently, but because he thinks I have someone else, and don't care about H anymore, H will move on too.

This sounds confusing.

Friend thinks H is being nice being to me because he is starting to wake up. H thinks I have someone else. I have acted like I don't care about H. Friend thinks H might be thinking why bother since I have moved on. Friend thinks I need to tell H how I feel so H knows he has options.