At what point should I just back off and leave him alone?

Anonymous
The last time we hung out or even really spoke to each other was a week ago. The last time we hung out, he was all about wanting to hang out again the next day, but I was busy, so I couldn't.

Now, it's like he's suddenly lost all interest in me. He actually did text me a couple of days ago, and I asked if we were going to hang out again sometime soon, and he said, "I hope so. : )" Then, we made plans to hang out the next day. I waited around for him the next day, he never texted me or anything... Finally, I asked if we were still on, and he said that some stuff came up and rescheduled for tonight. :( Wtf? Do you think he just doesn't want to...? Should I leave him alone? I don't want to bother him...

Probably and incredibly obvious answer to this problem, but I've never been good at dating..
Updates
+1 y
I kept it vague to keep it short. Those are the only important details.
Updates
+1 y
We've been talking/hanging out and stuff for probably about a month and a half, if that matters.
At what point should I just back off and leave him alone?
4 Opinion