So you find out he is talking to others like he started with you and becoming more “relaxed” when it comes to you (conversation, doing stuff together). And at first you told your girls you wouldn’t get attached this time, because you already know he follows a ton of girls etc. etc. but oh well, some things we never learn, do we? In matters of “like”, we are all fifteen at heart, and heart is forever inexperienced.
Let’s say these are now the places where you can meet someone, date, get attached and be paranoid every time you scroll down to search for his username and activity, thinking “who is this? Are they talking” and overthinking about it, while playing the stay cool attitude.