Is my number up?

I dont take these things lightly. Or maybe I do until it has become blantly wierd. And it has. The mail man at work is making me feel uncomfortable. I think my work associates think it is funny and harmless. I used to think that but it has escalated. He has gone from just flirtacious comments like, "it is so nice to see your smiling face" to bringing me muffins ( two days in a row) and saying" Have a great weekend! Be good, and if you cant, call me!" What the hell does that mean. I am not going to except any more muffins. Of course I dont want to hurt his feelings or have my work superiors think I am being rude. I am starting to be concerned though. I feel like he might ask me out or wait for me after work. The guy isnt 20, he's like 55. Maybe it is harmless for him but it is creeping me out. I think I will start hanging out downstairs when I see the mail truck. Avoid. Thats my plan.