You've been a good friend and told her once and she has not chosen to believe you (she's in denial and in love) and believe it or not this is not uncommon. You owe her nothing else so let it be. She has chosen to ignore you or listen to reason so she's going to have to learn the hard way. Unfortunately you are going to have to sit back and let this one play out, but be there and pick her up when she needs some comfort.
He will forget about you and he will keep it a secret.
That is something you will have to ask him.
as a friend I'm telling you this as i care for you, but sorry to say your boyfriend is being unfaithful to you and unfortunately he is cheating.
Do nothing. It is between them.
it depends, if you have a friend with benefits that you makout and ect, yes it is cheating BUT, if you have a frend with benefits but you dont do anything sexual then no its not cheating
The only way you can be positive your boyfriend is cheating is by having a friend take you in their car and follow him one night.
they are cheating.
by asking your best friend to spy on him
You tell the truth and accept the consequences.
Well think of it this way: Who is more important to you? Your best friend or your boyfriend's friends?
You should tell your friend that he is cheating its best that she knows.
Ask them!!! And if you are wondering they probably are.