That period of time when:

I miss that time in college when I had all my friends within a few miles of me.

I can see why it would be nice to have a significant other after college to have someone there for you more often. During college, having a boyfriend or girlfriend could really hamper your growth in trying new things and meeting new people (imo). But after college, you realize, that you are no longer in the same stage nor same location as most of your friends. It becomes kind of lonely until you get used to not seeing your friends every day. The first year after college is the hardest for many reasons. And one of them is learning to cope with loneliness.