please respod i need help! im sorry its long

hi all,

i feel i can relate to someone atleast and tell me what to do, mine is the most awkward situation

my husband of 14 years cheated on me for past 4-5 years and i never found out bc i trusted him so much. 3 months ago i received a ltter in mail anonymous from someone telling me that my husband is having an affir with this ( name of the girl) for years and she is a whore and to take care of my health, i felt as if earth moved out of my feet. i aksde my hsuband, and unfortunately his family was visiting us that day, so i had to hide my emotions, i took him in our