For a friend like him, it mainly depends on what kind of relationship you want to keep with him.

If you are just a formulaic roommate, you just need to maintain a superficial relationship, regardless of whether he is selfish or boastful.

If he is your good friend, and besides these problems, he is worth making friends with.

Then you can try to be generous. Don't care about some small interests. Maybe you can influence him. He may be selfish to others. Maybe when you find that you are sincere to him, he will also pay for you. Or when you are closer, remind him to change a little.

As for bragging, you can take two attitudes towards it.

1, just listen to what he says. Listen to half of what he says, don't believe it all.

Remind him when to brag and when to take it seriously. This is a question of mutual trust between friends. )

Finally, I wish you have fun with your friends.