Yes, a 5'10" guy can marry a 5' tall girl, and height differences between partners are common and completely normal in relationships. Marriages are not determined by height, and couples come in all shapes and sizes. What matters most in a successful marriage is the love, respect, communication, and compatibility between the two individuals involved. Physical height should not be a significant factor in determining the success of a marriage or any relationship. Love and mutual understanding are far more important aspects to consider when thinking about marriage.