The feelings you’re describing have less to do about what he is or isn’t like, and more to do with you wishing others will like you. If you notice the pattern: “this other guy likes me, maybe I’m with the wrong guy”
I’ve felt the same feelings, thought the same thoughts, and I can tell you that this is because you are externalizing your needs for love and attention and seeking that initial buzz that comes with a new relationship. That jumbled mess of emotions with the tagline: “does he like me? Yes he does!”
The only thing that helps is for you to realize that you’re the one in charge of these thoughts and emotions and it’s you, not him (whoever you are with, it doesn’t matter, you will find the same thoughts after a while).
You don’t need the kind of attention that other guys give you for being good looking or anything else. The kind of attention you need is from your accomplishments and the kind of love that you and only you can give to yourself.