<human>: Can you summarize the given text in a few sentences?

I commute to work using a few city buses. Many people come from the area where I live to the area where I work, so I see some of the same faces often. I'm not really the type who takes up conversing with strangers on the bus, even if I see them everyday, but one day, a man comes up to me and says he sees me on the same buses as him often. We start chatting about work and commuting, and see each other a few days after that [we don't always catch the same bus].

I didn't think a whole lot of it [other than sometimes I would just rather keep to myself on my commute, and it was someone uncomfortable to have to talk to someone all the time, extroverted introvert probs]. One day he asked me for my phone number. I couldn't think of a reason why he would need it, but I also couldn't figure out how to not give it to him. He has texted me when we don't catch the same bus telling me to have a good day.

One day when we got off the bus, he said we should get lunch some time. I tried to respond politely and ambiguously. He has now brought it back up in a text to which I said, "maybe next week", instead of the proposed tomorrow. 

I am feeling confused because this guy does not give off creepy vibes at all [he just seems sort of lonely, to which I can relate], but I still think the relationship he wants with me is sort of inappropriate [we don't work in the same office, old enough to be my dad, I have a boyfriend and I think he is unmarried with no kids]. I could use a friend out here but I'm not sure if he wants more. I may have already screwed up by telling him where I work if he is a real creep. I just hate assuming that about him as I don't really know him.
<bot>: Met older man on city bus commute who asked for my phone number, now is requesting lunch. He seems harmless enough but am I being too nice? Is this friendship inappropriate?