Hi Precious_male24,
Its really an interesting topic. I would say that we should confess our past relationship to our partner as there should not be any miss understanding between the two after marriage.
Even if this is theoretically true, practically it has many disadvantages. Trying to be honest we spill out all our secrets before marriage but sometimes this may tense he relations between the two. In case your partner is quite understanding then there are little chances of such things but normally which doesn't happen.
Finally what I would say about above topic is, try to confess to your partner but looking at the situation and the nature of her. If her nature is friendly and quite understanding go ahead..confess to her..but if it is not then I would suggest don't put Axe on your own leg.