Should I Disregard the'What if' Voice in my Head

I have been dating a girl for about 3 1/2 months. I really like this girl and she is great to me. But I have a friend, another girl, who in the past I was interested in but she always had a boyfriend. She and her boyfriend broke up and she has made it apparent that if I broke up with my girlfriend that we could start something.

I don't know what to do! I really like my girlfriend. I even think I love her, but there is always the thought in my mind 'what if?' Should I try to pursue a relationship with my friend and scrap the one I am in now or should I just disregard the 'what if?' voice in my head?

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