We've known each other for 14-15 years. We've had great moments and used to know each other like brothers. But since about 2 years ago he's been drastically changing for the worse. He says no to virtually everything and never proposes his own ideas. Conversations have just dried up because he's lost almost all of his interests. He's pushed everyone away but I've stuck around because I value our friendship but each week he's now getting worse and anymore all he does is annoy me and make me aggravated. I don't even enjoy his company anymore. What's there to do?