I was raped and lost my virginity. I have a fiance which I'm afraid of losing. How do I do it. Should i tell him or not. If I'm to tell him how..?

If you are serious about your relationship and really want it to go far? Open up to him and let him decide. It is better he know now and face the consequence than for him to know later and and end up seeing you in bad light and end up hurting yourself more.

Note a broken relationship is better than a broken marriage. Now that you two have not cross the boundary into marriage, it better you come out about the past and open up to him than for him to find later and think you lure him into marriage.