I'll just leave this here. I think deceit, whether by commission or omission, is the biggest character-flaw deal breaker I can think of.
If you want to stay with me, DO. NOT. Lie to me. Be real about things- your heart, your situation, your life. Be honest.
But if you want me to drop you like a hot potato, lie. Just blow smoke, stretch the truth until it's completely unrecognizable, make promises you have absolutely no intention of keeping. Lie.