How do I let him know I won't wait around forever?

Anonymous
There's a guy who I'm pretty sure is blatently not interested any more, but I have no idea if I'm right or not. I don't want to say something and mess things up if I'm wrong. But I feel like I need to let him know that I won't wait around forever, that I'm not gonna waste my time on him when I could be out there meeting other people. He's a lovely person, but I've been hurt to many times to get attached to someone who doesn't care. So do I let him know or not? I haven't seen him in 2/3 weeks and I probably won't see him any time soon. Obviously I'm a little bit down about it because he's a decent guy and someone not being interested in you sucks, but I just don't know what to do. And what do you think I should say? I don't want to sound to harsh? :/ :(
How do I let him know I won't wait around forever?
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