γαμήσῃ [12 verses](verb 3rd sg aor subj act) is from gameo, which mean "to marry" and "to take a wife." For a woman, it means "to give yourself in marriage." It can also mean to "take a lover. -- The word translated as "I have married" means, for a man, "to take a wife" and for a woman, to "give yourself in marriage."  It is not the past tense, but in a tense meaning something happening at some time.