Confidence gone too far?

27(m) I work a customer service job, In a place where I see a lot of the same people many times on a regular basis. I’ve been improving my self confidence in many ways and one day I was feeling particularly bold and was experimenting with making stronger eye contact with people than normal. It was a deliberate choice and I didn’t mean harm by it, but one of my (female) customers came by and she was one I recognized before so I went to help her quickly as I often try to do with ones i recognize. I did acknowledge in my self that I found her attractive, I find many people attractive male and female I’m just kind of a people appreciator.

I’ve always also been a naturally flirty type when Im feeling good. I made this direct eye contact with her and small talked like I normally do, she joked about how it must be bad that I recognize her for coming to the place so often and I smiled and said “No, you’re just memorable” Her smile went away and she looks down and grabbed what she needed and left. Obviously I made her uncomfortable and I feel very guilty about it, especially because I am supposed to be professional and was performing a job.

I don’t know if there’s anything I should do other than trying to be more careful with how I treat people. Most of the time the customers I have enjoy the small talk I make and I love to give people compliments and it generally seems to be welcomed. But in this case I just feel like a creep. I don’t really know what to do but it’s 2 am so it’s obviously keeping me up at night.