Most Helpful Guy
He is not acting weird, he is acting like a guy that is actively pursuing different relationships. He is clearly no longer committed to you, and clearly trying to move on. It takes almost no effort for him to maintain a LD relationship while he does this, so he hasn't bothered to break up with you, but he is clearly shopping the market, and taking your name off instagram is a clear sign that he is trying to make sure the other girls that he is pursuing don't know you are in the picture.
He is not thinking about your feelings, not caring about how his actions affect you, or make you feel. He has emotionally checked out of the relationship. It is only a matter of time now before he checks out completely. Most likely he will wait until he has someone else 'secured' before he does it, but once that happens he will be gone.
You deserve better than this, and you should take control of your life and your feelings and end this relationship. It is going to cause you nothing but emotional distress moving forward, and while it may hurt to end it will be far better for your mental health in the long run. Dragging this out will do much more severe emotional damage over time.
Most Helpful Girl
Sounds less like he is trying to make you jealous and is more trying to get you to break up with him.