You were Megatron's human wife/husband/partner and the two of you had three kids together,you had no idea of Megatron's true identity as a decepticon leader and war tyrant because he hid as a human ever since he met you and had never told you he was anything of his true identity,heck he didn't even use his true name around you,instead went by the human name Nathan,well one day he came home looking exhausted and you decide to ask him what is wrong