How do you know you're truly in love?

Skipping the infatuation, the false image you put on them, the honeymoon phase. How do you know you truly love someone for who they are? Is it when you start doing things without thinking? Is it a feeling that hits out of no where? Is it a specific moment where it all came together?

I felt it myself but I am curious about the mans side. Either side is welcome though!

How do you know you're truly in love?
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