u/Ok-Biscotti-8673

For reference i work at a local market and this guys had been coming for about four weeks. Each time he would talk to me and I was polite but just in the same way I am to any other customer. This week though he had come back multiple times in the day and the third time he said ”I have a question for you. Are you seeing anyone?” I was super uncomfortable and so lied saying “Yeah I have a girlfriend.” Then he ran away.
Thing is. He is 24 and I am allllllloooootttttttt younger than that and I look my age (I even had pigtails in last week.) Do you guys think it was an innocent mistake? What should I do if he comes back? I‘m a bit scared and just feel kind of violated in a way.