Bad Friends
Back in high school, I had a group of friends that mostly consisted of girls. I wasn't necessarily friends with them because they were girls I was interested in or anything, but because they were fellow students at my school who happened to live in the same neighborhood as me. So we often hung out at the bus stop together or walked to each other's houses to do stuff after school. I considered them among my better friends until I started noticing things about them. For example, I'm pretty sure one of them stole money directly out of my bedroom in my own home once, and while I was pretty convinced I knew which one of them had done it, I had no evidence pinpointing any one of them other than to say that they had all been in my room that day, so it was something I really only knew and kept to myself. Most egregiously though, for me anyway, was that after high school, the one I thought I was closest to got married and never really thought to get in touch with me again afterward