Should I have sex with her?

Since about 2 months ago, I started dating a lovely woman. We are dating without having talked about exclusivity yet, however, I 've always been very faithful in my relationships. But a couple of weeks ago, I met a younger woman that I find incredibly sexy. We are just talking, but she is flirting with me, and I am trying so hard to hide that I like her back. I have never mentioned her that I have some kind of a relationship that is starting and is about to become something more serious by the time. I don't want to be unfaithful but at the same time I want to have sex with her so bad

Should I have sex with her?
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