I gave a dude my number but I'm not interested in him romantically. Do I reply to his texts?

So I met this dude on the subway. He came up and sat next to me and we started talking and right before it was my stop, he asked for my number. I didn't want to be rude so I gave it to him. Since, he has texted me and I'm not sure if I should reply because I'm not interested in a relationship. He is a pleasant dude to be around and I would text back but would this make it seem like I'm interested in him romantically? I don't want to lead him on. What should I do? Do I be honest and tell him I'm not interested? Should I just not respond? Are there any other options I can do?
I gave a dude my number but I'm not interested in him romantically. Do I reply to his texts?
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