Should I trust my gut?

There is this guy that I've been seeing lately (we are still in the getting to know each other phase)
I told him that since we are still getting to know each other, it would be fine for us to see other people, while still talking.
He instited that we shouldn't and that he really liked me and that he wants a relationship with me... but I recently found out that he's been texting other girls being my back for some time now. Why is he lying to my face about his feelings for me, it really hurts to know the truth. How do I confront him about it? I don't want to act irrational
Should I trust my gut?
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