<human>: Condense the text into a few key points

My new friend introduced me to her brother a week ago. Her brother is... strange to say the least. He doesn't have any friends and he comes on very strong. But we got along pretty well and he asked me out on a date. I said yes but as I get to know him, the less I'm interested. I don't want to take it back because he's lonely and he's never been on a date before but I really don't wanna go...

What should I do? Thanks in advanced.
<bot>: Friend's brother asked me out and I don't wanna go but it's his first date, what do I do?