Why is it that after a few months a guy loses interest? He says he loves me a lot, but he's busy preparing for our future. How does a female respond to that when she just wants to be with him, spend every waking moment with him!
If he didn't love you, why would he be preparing for your future? However, why are you even planning a future when you've only been together for a few months? The purpose of dating is to find out what someone is about and if you're compatible for the long term. The fact that you say you want to spend every waking moment with him tells me you're still in the "honeymoon" phase of your relationship. You've put him on a pedestal. When you have taken him down from that pedestal, have seen his positive and negative qualities (and he has seen yours) and you still want to be together, then and only then, should you be planning a future.