My girlfriend told me last week that she felt like she wasn't

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My girlfriend told me last week that she felt like she wasn't satisfying me enough. I asked her why and it came down to basically her own insecurities. She suggested opening a one way relationship where I'd be able to have sex with other women but she would stay monogamous. I turned her down and told her we'd work on her confidence. Although, now all of a sudden I can't stop thinking about other women. I would never cheat on her but since that prospect opened up I've felt more attracted to many people and thought of going back and taking up her offer. For some reason I'm getting more women complimenting and approaching me and such as of late. I feel like a dick head for even having these thoughts. Should I tell her about it or do some sort of mental cleaning? I don't like feeling this shit, I should be grateful I have her in my life at all.