Most Helpful Girl
People may not agree with me, but if you really love her, you will put everything on the plate and start your relationship on a clean slate. I know I'd appreciate that. This also is important becasue you don't want her to somewhere down the line, run into the person you slept with or find out from someone else about your fling becasue that would ruin an amazing relationship. I understand that this happened when you guys were not together and she may say she is okay with it, but really is anyone really ok when they say they are? Girls will always feel a slight jealousy and insecurity, especially if she likes/loves you a lot.
Most Helpful Guy
the only question is shold you tell her you've had sex with someone? It's 100% up to you but you are under absolutely no obligation to tell anyone anything