Accept her feelings. She needs to choose you, don't lie and be honest about what happened. Admit you screwed up, if you did. Flowers help. If she wants to know if you've got some inner strength, here is your chance. Show her you can stand on your own merits, and not misrepresent yourself. If she chooses to walk away, just try to let her know how it makes you feel, thats it. Don't prevent it. Maybe she will come back in the future. It happened to me. I've been married for 10 years to a person who left me for no real reason. It hurt. I forgave her. Now we love each other 10X more. It will be hard. My relationship pushed me to the edge of what I could handle. It was all worth it.