Pretty much every time I was inpatient, there was someone I befriended (not in any romantic interest, but friendly so) and we even exchanged contact information. I never contacted any of them, and they didn't contact me either. The hospital is a weird environment and not at all real world. Generally, the reason I never contact people I met was, quite honestly, I wanted to put that hospital visit completely behind me, including even the nice people I met. I suspect that is what most want to do. Real life post hospital is very different than the odd unreality of the hospital environment.