a stranger waited outside my workplace - need some advice, assalamu alaikum

assalamu alaikum, this happened a month ago and I've been overthinking it ever since. I'd really appreciate any closure, opinions, and perspectives from a Muslim point of view. For context: I'm a 20-year-old woman and I work alone closing a small retail shop in a mall. I usually stay about 15 minutes after the mall closes to finish counting cash, sweeping, and locking up. Sometimes my manager schedules me for an extra 30 minutes. Because it's a small store, I often close by myself. One evening I stayed later because a few customers bought things. After they left and I was finishing up, a man - maybe late 20s or around 30 - came into the store. I'd seen him around the mall working, but we'd never spoken, so he was basically a stranger to me. He asked, “are you still closing?” I said yes and assumed he wanted to buy something, so I asked if he needed anything. He replied, “No I just wanted to talk,” and then left. I was a little confused but kept doing the closing tasks. After that I noticed the till was short by $50. I got worried, texted my manager, and started recounting. While dealing with that, I noticed a security guard staring into the store and telling someone the mall was closed and to leave. I was stressed about the cash issue and forgot about the man for a moment. The cash issue got sorted. It was about 30 minutes after closing when I saw security escort some people out and was getting ready to go. I had a sick feeling in my stomach - I was tired and not feeling great already. When I stepped out to lock the gates, I saw the same man sitting on a bench near my shop with two drinks beside him. The mall was empty - not a single person. He said, “do you want a drink?” I asked why, and he said, “to talk.” I told him I had to go home. He then offered to drop me at the bus stop. When I moved toward the mall doors he said that one was locked and pointed to another door across the mall that was a long walk; he seemed to be going that way too. I didn't want to walk with him through most of the mall, so I chose another exit that stays unlocked. That's all that happened. He left when I said I had to go home. I don't know his intentions. Maybe he meant no harm and just wanted to meet someone at the mall, but the timing and place felt wrong. The whole mall was empty and closed. Why would someone want to talk in the middle of an empty mall? Why offer a drink and to walk me to the bus stop without asking my permission? Also, why didn't security fully handle him? I thought they should have told him to leave since the mall was closed. I think I heard security say the mall was closed, but the man didn't leave right away. I don't work there often - maybe twice or sometimes once a week. The next time I closed, I called security ahead of time and my mother came with me because I still felt uneasy. I don't want to assume the worst, but I want to be safe. I still lose sleep thinking about it and feel off. Did I overreact by involving security and having my mom come? Was this really a weird situation or am I making it bigger in my head? Could I have handled anything differently? Why might he have waited and why didn't security make him leave? If anyone can share practical safety advice and an Islamic perspective to help me stop overthinking, I would be very grateful. Jazakum Allah khair.