Why don't I like to play the guitar anymore?

At first I thought you might have been in a 'guitar rut', which is when you find you can't find any more amusement for playing, but I think it could be your depression. When I went through a depression nothing was fun anymore, and I usually loved guitar. For now, concentrate on getting better with your depression, and when it comes to an end, you'll have fun with the guitar again. I can tell you still want to lplay, otherwise you would not have asked this question, so just be patient.