What would you honestly have done different if he admitted to liking her a lttle? Now I'll even ask what would you have done different if he had admitted to being with her once?
You would have been crushed and you would have exploded so get that part out now, so you can think. Would you have loved him any less in your heart? What did you feel the last time you were near him? Would you have felt the same way of he had come totally clean and confessed all his sins?
This is some very serious thinking I'm wanting you to do so I want you to be honest with yourself. You don't have to answer me here.
He is human. He was scared to lose you when he knew he wanted to return. He is a sinner. We are all sinners. If he had truly confessed he would have also had to include being weak and scared. He wants to come back. That is not up to him. You have to decide your limits and boundries. We are taught to be mercyful and forgiving. Do you have more to lose by stopping, or proceeding carefully? Now add your own questions and give this time.
Before I run, how did she get your contact info? What was honestly in it for her to do so? I don't know. If she is trying to come between you, can you believe anything she says? I think you needed to be able to answer most of my questions even if she had not contacted you.
May God bless you and grant you wisdom on this, provide you with the strength to resist evil, and the courage to face all that life presents.