What does it mean when you're called a Sister by your significant other? (details within)

Is he simply not attracted to me or suck at accepting rejection?

Recently a family acquaintance asked me out on a dinner date. I accepted and we arranged a set day and time to meet. During the meal I felt very uncomfortable with what was being said and asked. He had shared his preferences and expectations which he looked for in a partner. I was a bit offended knowing personally that I did not fit his criteria and even asked what he saw in me. He said I had “potential” being younger I’d have the time to change; he is older than I am by seven years. Again, I took offense, I did not want to change into someone that he would date; I wanted someone who was willing to accept me for me.

Fast forward, a day later after our dinner I contacted him saying we were not compatible for one another and because of our family’s’ ties we would remain as friends; keeping personal and professional separate. Unfortunately I was not able to say this in person but through social networking in a private message. He apologized and said he was just excited to see me and tried asking as many questions as possible in order to get to know me. He admitted he still liked me and was upset that I had turned a cold shoulder so soon. I told him another date would not be appropriate but something more casual would be fine as friends. This time it went well. He asked me to join him for dinner unexpectedly another night, he showed up at my house and drove me to an unknown destination. Again he gave me a list of his preferences….upset we argued in our ride back to my house. Ready to leave his car he kissed me goodnight. It felt forced.

Days later I asked if we could get together to talk, I wanted to end things with him. He came over and talked; he laughed and said he was glad I brought it up because he had apparently felt the same. He then said after kissing me it did not feel right, that it was like kissing his sister. I was extremely confused but the tension was now gone. We both were laughing now on how silly it was. We both agreed on being friends or at least fake siblings by the end of the night.

Can someone truly define a person by one kiss? He has always joked and called me his younger sister from the get go saying he was only teasing me. Now it’s just weird… being kissed and called his sister. Can two people of opposite genders just be friends without any attractions or should I simply ignore him?