I got chatting to a man in an interest group and we swapped numbers. A week later we went for a walk but I decided I didn't want to see him again. I told him I wasn't looking for a relationship but since then he's invited me out at very short notice a couple of times which I turned down. I've just had another long rambling message inviting me on a night out tonight, a request to meet so he can present me with his holiday snaps😴 and a further request to go on holiday with him next week. I feel like I want to be very forthright and even rude to him but we're in the same interest group so in a way I don't want to fall out with him. It's not like online dating where you can just draw a line under something and never see them again. What's the best way to handle this?