Why will he not just say he isn’t interested?

I’ve been talking to an old flame for a while. He’s become less talkative over the past few weeks. He says he’s busy but we didn’t speak for five days at one point. I just said if he isn’t interested then it’s fine but he says I’m “assuming things”. I asked if he wants to meet and he said yes and that we could talk about it later that day. Well we never spoke later that day at all. And he hasn’t said anything since. It’s really obvious he isn’t interested and I don’t understand why he can’t just say so when I’ve asked. I’m just fed up with it so I’ve just called it off. Why is he doing this?

Why will he not just say he isn’t interested?
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