Being fawned over by someone you're trying to move on from or someone you have moved on from is really frustrating. Especially if they said they want to be friends but then they try to put the moves on you. It's completely disrespectful and if it were a guy doing that to a girl we would all agree and call him a creep. It doesn't matter that Amane still loves her. She obviously doesn't love her enough to respect her boundaries and her feelings. Regardless on the break up.
I do feel for Amane though, having lingering feelings for someone. But trying to force yourself onto them just hurts both parties and that's how you LOSE someone forever.