Adding a guy on fb may seem like stalking?

[Teddy]

So I started working at this fast food place. I had been working there like a month and a half when this guy from another store transferred to our store because we needed extra help. Like a week later, he was in a small car accident and I guess he couldn't work because of his car. Not sure but I just didn't see him after that and he prob went back to his original store. Coworkers used to tease me saying they had asked if he liked me and he would just laugh. He was actually really nice. So ever since I've been thinking like what if we had talked more? I don't know why but I decided to look for him on Facebook. I found him but I feel as though it might be weird to add him. Would it be considered stalking? I mean since I didn't even know his last name till I saw the work schedule and we didn't talk THAT much. Should I just message him and be like "hey, what happened? you never came back to our store" or just add him and go from there? gahhh I'm overthinking.
but it happened around october so that's why it seems like it still won't be a good reason :/ IDK if it makes a difference but I'm 19 and he's 22