Is this what friends do?

Hey everyone 👋🤗 I am just looking for thoughts and opinions here if that is okay. Had this guy friend who I worked with, we would always somehow end up alone together but just chat or laugh, he always helped me with everything. On nights out it would always be just us left together, he would always say things that were specific about me like how I would react to things or the way I move. Whenever we were in a group of someone else would be talking he would always look towards me and catch my eye. We used to have our own little jokes and he would sit with his knee touching my knee not moving. He left work and at his leaving lunch I had written he was my og in the card when one of the guys asked him to make a speech he said my og and then gathered himself. People always assumed something was going on with us and I used to be mistaken for being his friend to give you an idea of how close we were. Am I stupid to think there was something there? Well he was messaging to see how I was doing lately and told me he had a girlfriend? Can I ask what you all think, was he just flirting with me for that long as a joke or to keep busy or something? I just want to understand.

Is this what friends do?
Post Opinion