<human>: Can you provide a brief overview of the text?

I studied abroad first semester of my senior year of college and when I came back, I got a cold reception from my friends.  I was very close with most of these guys, but when I got back things were different.  

When I tried to get in touch with them, they either didn't pick up their phones (relevant: most are lazy about picking up their phone anyway, not necessarily related to the fact that I was calling) or would text me something back saying they weren't doing anything.  None of them called me, ever.  I went to a party with most of them right after I got back and, while none of them seemed to have changed, I got the impression that no one was enthusiastic about seeing me back.  And throughout the year I'd run into them at bars and at mutual friends' parties, we'd talk and they'd be friendly enough, but that was it.  I got the message and stopped trying to get in touch with them after about a month; it didn't help that I was working more than I had in years past and didn't have as much free time.

This whole thing left me confused as shit.  Beforehand, I figured that since I was going abroad and I wasn't living with any of them when I came back, they would have their own routines and I wouldn't be around them all the time.  But I never expected it to be this bad.  These were the drinking and pot-smoking buddies I chilled with on an everyday basis all through college.  Some of these guys I had lived with for 2-3 years, and to be perfectly honest it sucked not hanging out with them.  I made a few new friends and it was an OK last semester but now that I've graduated, I wonder if I should even bother trying to get in touch with any of them again.  Except for 1 or 2, I don't even know where they're working now.
<bot>: Went abroad, came back and old friends took no initiative to get in touch. Confused - now that I've graduated, try again?