The snake lied to Eve.
Eve fell for it.
Eve lied to Adam.
Adam fell for it.
Note that the snake went after Eve, not Adam. The snake knew what it was doing.
Actually, Adam acted on his own conscience; the Bible says he was not tempted (1 Timothy 2:14) and yet sinned (Isaiah 43:27).
Adam got up one warm Spring morning and looked forward to a delicious apple-free breakfast of pancakes, maple syrup, and eggnog.
Then, to his surprise, Eve rushed towards him with an apple.
Yes.
No.
No.
Eve did not lie to Adam, Adam stood there and watched the snake sell his wife a line of goods and did nothing. Eve was his sacrificial penguin. When she ate and did not die right away he thought he was good to go.
And when God confronted him about it Adam blamed God.
These was a reason Eve got a curse and a promise and Adam got only a curse.