No, he is totally wrong. The future could be controlled by himself. Everyone could. You could have something in your mind to guide you to your love. Everyone could choose the life he wants. If he did say that, trust me, it's just his excuse. It's nothing relative with mature, or age. He didn't think he had found the one he wanted, so he couldn't guarantee anything. No promise. So, obviously he is not worthy, for you. Why should you be stubbon to ask why, or whether it's just excuse or not. Let it be. Never, never, expect too much on everything, especially love. Never believe any fairy tale. If you were so lucky to find someone who you love and who loves you, and if lucky enough you could accompany each other for some years, no matter how long it is, pls just appreciate it, and enjoy it. Life is not easy. But if you hold this kind of attitude, everything would be much easier.