I study a couple of times a week at the local library as I have a noisy roommate and the library is a quiet place. More than half the time when I am at the library I run into a friend of my older brother who works there. We always chat for a bit but nothing beyond that. About 2 weeks ago he mentioned to me that he thought I was beautiful but had never said anything before because of his friendship with my brother. I laughed it off and didn’t think much of it until last week when he asked for my phone number. It wasn’t something I really wanted to give but I did it anyways and ended up getting his as well. John (my brothers friend) is good looking and everything but he is almost 12 years older than me. I am also not really interested in him in that way as I have known him since I was a small kid. In other situations when someone asks for my number and I don’t want to give it out I just give him a fake number. The problem here is that I see him at the library all the time and I know him through my brother so I cannot really avoid the situation.
He has texted me a few times and I have texted him back just short replies. He did call me and ask me out this Saturday. Luckily I had plans already and told him so. He called again today but I didn’t answer and he never left a message.
This is a sticky situation for me. How can I nip this in the bud and let this guy down nicely but firmly?