I am not satisfied with the way my 1,5 year girlfriend is behaving. I think she is losing interest. I am currently monitoring how she behaves and I think I should tell her that I am not happy with how she is doing recently. However, if I tell her directly that I feel like she's being disinterested, it will make me seem like a butthurt and make it even worse. What is the proper way of telling her that I'm about to leave her because I don't like how she's behaving recently?