Get under someone else. Focus on yourself. Start a new hobby. Mute/unfollow, and do whatever else you have to do to get them out of your online world. I've been through so many phases in my life, but nothing compares to when I can't get over someone. I'll go through all these phases like trying to be friends with them, trying to forget them, trying to be with someone else, trying to be happy without them, and then I'll relapse and try to be with them again. It's like my brain can't make up its mind, and I just keep going back and forth. It's really frustrating, and I don't know what to do.