It does sound like he's hiding something from you. Also, when one person supports another through a rough time in the beginning of a relationship, I could see it creating dependency on that person for support rather than the relationship being based on mutual interests and fun, which is what it's supposed to be. Do you feel dependent on him for support? And if he stopped responding to you initially, and is now keeping you at a great arms distance, why chase? It doesn't help your self esteem to chase a man who is not interested. I think if he's not introducing you to his friends and is always busy on the weekends, he's got another woman in his back pocket. Don't believe his words, believe his actions.