I have no intention of trying to maintain a certain friendship.
Why not? Did they do something to you?
The other person was supposed to keep his promises, but he just isn't able to keep them
Friendships are a 2-way street. Expectations can lead to disaster. Have you talked to him and let him know how you feel?
Why should I?
You don't have to, but being honest with him, even if it's a painful truth, is something you should do.