Your friend knew you were supposed to meet so he has a responsibility to honor his word. I feel as if you are making excuses for him in order to justify his selfish behavior.
In general, I would say it is not wise to chase after a man. He should come to you and prove himself to you. In this way, you will know that he wants you and there will be no doubt. If you chase after a man then you appear needy and desperate and then he may think he can play with you and use you because he knows that you want him so bad.
Even though it is hard I feel the best thing to do is to pull back and stop messaging him. If he really cares about you then he will have to go after you. I know this is hard but you need to protect your heart and you will gain some self-respect by doing this. You may want this man but if you're honest with yourself you will see that you don't need this man. All you really need is God and God knows that you want a relationship so maybe God needs to teach this man a hard lesson in life about selfishness or even though you may not believe it maybe God has someone else for you that is far superior in personality and character.