 Don't confuse regret for repentance. The flesh lies to you and you say, I'll never do that again, but deep down in your heart, you're saying, well, maybe at least not for a couple of weeks. This comes back to the very crafty nature of the flesh, which will say things like, you feel bad, God, I'm sorry. And really what you want is relief from the guilt, but not release from the sin. To repent means to change your mind. It's to come into agreement with God and to say, I agree with you. What I'm doing, how I'm thinking it's wrong. This thing has to go now and it has to go permanently and it has to go in all forms.