Is ignorance really blilss??

Hmmmmm...over the weekend, someone slapped me with this thought...got me thinking about it..
Is ignorance really bliss?? Honest truth?..I think it is...and I am sure not convicing myself about it...this about all the situations

1) Been going out with a man for 18 months...now 18 months for Darshini is LONG!!...so the story...boy meets girl, boy and girl like each other, start the relatioship on friendship basis for a little while and venture into the lust and stayed on there for a long time...only to find out at the 18th month that the girl was not the only girl....is ignorance here really bliss?? then it was so paintful...but the pain doesn't stay for long...it's all long gone now and we have moved out and on...when I see him now, it never crosses my mind, not sure of his though...

2) Divorce of my parents...this one, ignorance is certainly bliss....till this very moment, after 6 years since they were legally divorced, I do not want to know the cause of it all....because, naturally you end up hating someone, blaming someone and hurting someone...life is so blissful now, and I wouldn't want to mess that up

3) I just think when you know too much, you draw conclusions in your head....boy meets girl, girl finds boy rather interesting, gril falls for boy, only to find out boy like someone else...now that someone will always be in girl's mind, day and night...but if girl never knew that in the first place, she would have been happier..not so clinggy to boy, given boy all that space ...see, ignorance would have been bliss

4) Girl had an abortion, girl now meet the perfect boy of her dreams...they are planning to get married...do you think girl should ever tell boy about the past?? Ignorance is bliss....trust me on this one, if boy ever know that fact from girl, he may be all cool and all, but when things turn sour, boy oh boy, he will bring it up....

i honestly think ignorance is bliss...because if i know, i will keep imagining it...but if i didn't and you left hints...i will soon forget all that hints, especially if we are having loads of good times togetehr...this is in every friendship and relationship....you might say, where's the trust then?? but if you know the truth will hurt someone, then why tell...life is too short to be living it so hurtful all the time...do i make sense??