Andy is a pathological liar. Him "admitting" to anything is NO proof of anything, because at any moment, he will say whatever he thinks will work best to further his interests/plans. So if he thinks that privately "admitting" to YOU right NOW that he lied about X is the best way to go, he'll do just that, with no regards to whether this is true or not - and then he'll have zero problem saying the exact opposite thing to someone else minutes later, or to you or everyone days later. That's what being "a lying liar who lies" MEANS: his word is the LAST thing you should take as a proof of anything.