Would you tell your current gf/bf regarding your previous relationship?

Why would you not tell the truth? If you are uncomfortable talking about your past relationships, then you probably shouldn't be in one.

I never tell all the truth. I don't tell a lie him. But I think that if I leave my old relationship mean that I'm not interested in it more. So, I don't need to tell him. Moreover, the story of old relationship can make a misunderstand which you and your bf don't want to have.

Lol, it might sound funny, but i am never going to be there to tell my girlfriend about my previous relationship (which i never had, of course). I hope.. If this relationship is ruined, i am going to stay single for a long time, until, i am married to anybody. I don't know, but i guess if i had one, i am going to say all about it to my girlfriend. I am sure i would have nothing to hide from her.

Yes, of course. I don't like to keep secret and hide something with my boyfriend. It will be more troublesome to explain it if in case, he will find and know something about our previous relationship which he never knew before from me.