People who don't like making friends should be introverts. They are afraid of strangers. When they meet strangers, they will have a very strong fear, and they will be shy and even at a loss. Therefore, they don't like dealing with strangers, and even have a resistance to strangers. Over time, they will get used to being alone, don't like making friends, and don't even know how to make friends. Moreover, they don't like to talk very much at ordinary times, and they don't attract enough attention. Naturally, they don't have many friends.
People who don't like making friends should take their time, because friends are a luxury and a rare thing for them, so they rarely really accept a person as a friend in their hearts, but once they are identified as his friends, they are important friends with similar interests.
Another possibility that you don't like making friends is that you think friends are troublesome. He may be used to the feeling of freedom and freedom of being alone, so for them, having too many friends does more harm than good, but it is a burden, so he doesn't like making new friends very much, but misses the past. Friends don't like making friends, but they are all people who will be kind to their friends wholeheartedly.
If he doesn't like making friends, maybe he doesn't like taking the initiative. Most of his friends were taken away by the other party. He may not like to take the initiative to chat up and contact.
The last possibility is that he is mentally ill and needs treatment. Maybe he's just joking with you, don't take it too seriously ~