Friends and their lives

Have you ever wondered why you you would bother keeping a friend who doesn't return calls, never comes to your place but expects you to come to his, ...
To compound issues, he wants to go in business with you. Now, if alarm bells are ringing, they are for me too. What to do?
There is so much in the bible about who a friend is. Mostly it talks about who you should be as a friend. I will continue to accept my friend as he is, since surely there are those who accept me. But enter into business? Somehow I cannot clearly see that vision.