<human>: I moved into a new apartment when I came home from Afghanistan last year. Being a friendly person I say hello and ask people how they're doing when I see them.  
  

Now this is where it gets complicated, there's a man with Down's Syndrome in my apartment complex. I always ask him how he's doing and say hi when I see him, he likes that I do woodwork out in my garage and he thinks my motorcycle is cool and asks me to take him for a ride (which is impossible), but now he constantly rings my doorbell and confronts me whenever he sees me to ask to hang out with him and his mother. I live with my fiance and she'll talk to him but he only asks her what I'm doing and tries to get me to hang out. I'm a busy man working 60 hour weeks while also trying to pick up some certifications and trying to see my friends and family every once in awhile. I tell him this and he doesn't understand, he even tells me he is disappointed in me and a bad friend.   
  

I honestly don't know what to do beside be rude to him and tell him I don't want to do puzzles with him and his mom. I've tried talking to him multiple times about it and in his mind, we are best buds and anything short of me doing puzzles with him is me blowing him off. I thought this would go away but he has been ringing my doorbell multiple times a week for the last 8 months. All I can do is pretend I'm not home because when I go down there it is always the same thing, "I was wondering you would like to come and do puzzles with me and my mother". "I'm sorry, I'm really busy, I'd love to hang out but I don't even have time to see my own mother" "Well I'm disappointed, you are a bad friend" "Sorry (awkwardly walking away)  
Please help. I feel like an awful person but I have no idea what to do. He even asks other residents to come and get me.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: There's a man with Down's Syndrome in my apartment who insists on me hanging out with him all the time when I just can't. But he doesn't understand and I can't bring myself to be mean to him.