Somebody says:
“Love is like an hourglass, with the heart filling up as the brain empties.” Do not let this happen to you.
Do not allow your emotions to override your mind. If you know that the relationship is not legit, do not use love as a good excuse to do a wrong thing. Unthinking people may call it romance, victims still call it a betrayal. Faithfulness is still a good thing. Trust me.