Can I guy have a girlfriend, but have deep feelings for another girl?

Can this even happen? Not so much he likes the look of the other girl, but actually have feelings for both? If so, can he really love his girlfriend or just likes her?

If this were to happen, why would the guy continue to be with the girlfriend knowing that he feels for another or hoping these feelings will subside?

How would he get over the other girl? Have you ever experienced this?

Can I guy have a girlfriend, but have deep feelings for another girl?
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