Avoidant behavior, where he demonstrates a complete reluctance to be in social situations and avoids emotional closeness, is where the big red flag exists.
Some guys who have 0 friends are constantly afraid of putting themselves in vulnerable situations where they are judged or criticized by people.
Unfortunately, prior to anything socially uncomfortable happening, he is already thinking that everyone is out to take advantage of him, and this compels him to develop a rigid self-defense mentality.
That’s where the complete reluctance to be in social situations and the avoidance of emotional closeness become so apparent.
It is not only one of the best hints that makes a guy notice you like him; it is possibly the best.
Although it feels intimidating at first, getting into the habit of making eye contact with a guy you like does an immense amount of good in your love life.