2. Unless you already hate each other, unless you have never loved each other before, unless you have no feelings for him at all, unless he has never entered your heart.
It's normal to know and spy on your ex's current life, and everyone has that curiosity. However, if you want to get out of your last relationship completely, you should try to reduce your snooping on your ex's life and let time dilute your memory of him, because if you keep snooping, it will have a great impact on your psychology and make it harder for you to get out of the shadow of your last relationship.
4. Generally, people who are more involved are more difficult to get out. Obviously, you are more involved than him.
You can start a new relationship if you want to get out completely. You must also stop prying into his life, find something busy, let yourself forget him slowly and give yourself some time. I'm sure I'll forget him one day