If a friend is unhappy, he will open a hotel and drink alone, and will not go to a bar without asking his friends. Why?

It shows that your friend is quite vigilant and can handle his emotional problems well while ensuring his own safety.

A person who goes to a hotel to check in for a drink instead of going to a bar can avoid the safety problem after getting drunk.

Even if you are drunk, you can have a place to rest, and you can avoid the trouble of cleaning your room after you get drunk. You only need to pay the cleaning fee of the hotel. Explain that your friend still enjoys it and will take care of himself.