How I interpret the Devil:
The Devil asks you to think about the limitations you have chosen.
Chosen marriage? It limits you.
Chosen to remain an addict? It limits you.
Chosen to work hard to make money to buy your dream house? It limits you.
Every choice will have its consequences. Are you willing to accept those consequences and make a commitment to your choice? If so, power to you.
If you do not like the consequences, you can choose differently: get a divorce, go to rehab, quit your job and move into your parents' basement.
The Devil is about choice, limitation, and commitment.
eta: In terms of 'betrayal' or 'lies' I can see the Devil as betraying oneself by only seeing the positive aspects of a choice and ignoring the negative consequences ("Whoop whoop, I love going out on Friday night and getting totally hammered and hooking up with strangers! So much FUN!!!"), or even as someone trying to sell you something and "leaving out" some of the less desirable aspects of that thing.