Sessions supported Cruz and his position and knows it better than you. You are making an assumption about his ttweet when it can be interpreted in a different way.
First, Sessions is on the record saying that what killed amnesty was Cantor’s defeat/Brat’s victory. Cruz didn’t lift his littlest finger to help Brat in any way, shape or form.
Second, Cruz’ tweet is not deep or mysterious. He expressed himself with simple clarity: first comes border ‘security,’ then comes legalization. Anyone with English as a first language can easily grasp what he meant.
And again, the “He was lying,” routine is just silly. Cruz had no reason to lie to his most devoted supporters.