Dealing with nasty Co workers ?

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I am not really being bullied at work but there is a tricky situation...there is a guy who is married and made a pass at me last year. I told him I was not interested and have ignored him since. Then, this young woman at the office joined - I attempted to befriend her as the new person but she soon displayed jealousy over the fact that I have a better position than her and that I own my own house,and have a good lifestyle (i worked hard for it)..lately, they have been hanging out together..when I pass by or speak to someone else - they look in my direction and snigger..I continue to ignore them both and just get on with my work. I laugh and joke with the others at the office and i get on well with the others - these 2 are just annoying. Shall I just ignore them? It bugs me that they are laughing at me..for what? by the way, when she found out he made a pass at me in the begining, she called this so called friend an idiot but i would never mention that as it would worsen things...what do you make of it all?