I've been liking a guy for some time but suddenly I don't really feel it anymore. Now I pretty much go meh when thinking about him, but sometimes I get concerned about how he's doing and still think about him. Do I still like him or what?

Many people have been in this type of situation before and it's totally normal. When you first start to have a crush on someone, the feeling is totally exciting and you feel like you are totally in love with this person. This feeling is very normal and it's name is limerence. But then after a while, that feeling starts to die down and although you still feel attracted to this person, that sense of limerence is no longer there.

So the most likely explanation is that yes, you do still have feelings for him, but your feelings of limerence is gone. You are no longer in the first stages of having a crush and it's healthy that you aren't infatuated with him anymore. That's why just roll with how you're feeling and don't stress out about it too much.