Does My girlfriend want attention from other guys? Why does she wear colored contacts?

Ok, so I just have a question. I’ve been dating my girl for about a year and a half now, but all of a sudden she’s started wearing colored contacts. My girlfriend is a very friendly girl, and I have no problems with it or insecurities. However, my girlfriend never wears her contacts around me, but wears them in social places without me. I don’t think she is cheating, but I wonder why she is wearing them. Especially knowing how much I like her natural eyes. So my question is, why would a girl in a relationship wear colored contacts or try to look more attractive when not around her boyfriend? Do girls still seek attention from other men when in relationships even if it isn’t to the extent of cheating?
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I have asked her face to face, and she doesn’t give a straightforward answer. However the thought of her wanting attention from others is a no go for me. It’s one thing to look good, but I just feel that she is trying to look good for others and I don’t understand it.
Does My girlfriend want attention from other guys? Why does she wear colored contacts?
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