is this more than being friendly?

My hubby thinks I have a stalker/guy interested(also finds it funny). This man for the past two years has shown interest but I put it off as him being a gentleman or polite. Fast forward two years he is complimenting me often, he just appears near me when I saw him elsewhere when arriving. He is changing how he looks(he is trying to look younger but he isn't that much older) he just had a more reserved look unlike me. I feel like I am full of myself but he really has been flirting more and more well it seems it. He often tells me how good I look, asking me about my life, how much he likes what makes me me...I am the total opposite of him and his wife. It wasn't until the change in his look and him almost waiting for me to mention it that I started to believe hubby that this guy is being more than just nice. I am not a friendly person but I am polite and have few friends and keep to myself. So I am not sure if this is just being friendly or if he is wanting more. I have not dated, flirted or even paid attention to another man/guy since 16(been with hubby since) so this is a little awkward. Lately people have been giving us those what's going on here looks when we talk and I know the gossip train has started at the place I cannot avoid him as he just appears. Am I full of myself or does this guy who is married with children like myself want more? I have not seen him do this with other women:/ he may but I haven't seen it. I am not interested in him but I also do not want to offend him as he is a nice enough person. Just its a little creepy.