is it good to date just only one girl why in your youthful age or have sex with one woman all your life ?
If you are lucky to have the first lady you date to have all what you desire in a lady, don’t bother looking for another. But in most cases you won’t find it in a lady you first date, so is advisable you date more than one to have your choice of marriage.
If she leaves you, as the only lady you have after you have dated for so long a year. You are finished be that.