Can men be in love or have a crush on one woman while having a ons/fling with others?

My guy friend confessed his feelings to me but oftentimes sleeps with many women he meets on tinder/bumble.

Is He lying to me or are his feelings for me genuine? I told him many Times that I‘m Not interested in a Romantic relationship with him but I‘m still curious.

Can men be in love or have a crush on one woman while having a ons/fling with others?
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