<human>: I've been with my guy for two years.  I've known this family friend -- my older brother's best friend, who is at every family function -- since I was seven years old.  Suddenly, a year ago, he starts sending me long-winded emails and poetry about me, plus philosophy about his unhappy marriage.  

I can't just tell him to completely stay out of my life, because I liked his friendship, before every single conversation included some kind of innuendo or melancholy of "when do I see you again" from him.  Before this, he would just talk to me like a big brother -- giving advice about school, work, etc.  Now that I'm out of school and am an official "grown up," he's apparently attracted to me.  

I told him on Friday that this isn't good for him, me, or his marriage.  He's got two kids -- one of them isn't even a year old -- and his wife is friends with everyone in the family as well.  But I just saw him and his family today, and after he left, he sent me a text that said, "What is this feeling called?"  He just won't leave it alone.  I tried to put it nicely, but I can't put it cruelly because I will definitely have to see him again, at the soonest next month when there's another family activity.  

My boyfriend's formative years were in the Army -- his attitude is "just handle it."  But this isn't some co-worker or acquaintance... this is the best man at my brother's wedding, the man whose best man was my brother!, the guy I had a crush on when I was eight, someone who is *always* at birthdays/weddings/funerals/holidays/whatever, and the person who encouraged me to pursue my current career.

How do I keep my guy happy without making things awkward for the other guy, my family, and his family?

Give me a shortened version of the text
<bot>: A family friend is in love with me, and I can't seem to get a handle on it.  This is upsetting my boyfriend, who is awesome, so please help.