Sometimes, we fail so badly, we just give up. But I'm here to tell you, there is no "too badly" for Christ to redeem you.
Peter denied even knowing Christ after swearing he'd never do such a thing mere hours earlier. But Christ didn't give up on him, but reappeared in Peter's life, calling him back to a life in fellowship with the Savior.
Whatever you've done, however badly you've messed up, your first move should be to run back to Christ. He is waiting for you!!