It's understandable that you felt insecure about your appearance, but lying and sending a picture that is not you is not a healthy or honest way to build a relationship. It's important to be genuine and authentic with someone you like.
Since you've already told her the truth and she expressed that her feelings have diminished, here are some steps you can take moving forward:
Apologize sincerely: Acknowledge your mistake and apologize sincerely for lying to her. Let her know that you regret your actions and that you understand the impact they had on her feelings.
Reflect on your behavior: Take some time to reflect on why you felt the need to lie and send a picture that wasn't you. Understanding your insecurities can help you work on improving your self-confidence and self-esteem.
Give her space: Respect her feelings and give her some space to process what has happened. It's natural for her to feel hurt or betrayed by the deception, and she may need time to decide how she wants to proceed.
Be patient and understanding: If she decides to continue talking to you, be patient and understanding. Rebuilding trust takes time, and it's essential to show her that you are committed to being honest and transparent in the future.
Focus on self-improvement: Use this experience as an opportunity for personal growth. Work on building your self-confidence and finding healthy ways to cope with any insecurities you may have.
Be honest moving forward: Moving forward, prioritize honesty in all your interactions. This includes being honest with yourself and others about who you are and what you want.
Learn from the experience: Learn from your mistake and use it as a stepping stone to become a better person. Recognize that honesty and authenticity are vital in any relationship.
It's important to remember that trust is a crucial foundation in any relationship, and lying can severely damage that trust. While there's no guarantee that her feelings will completely return, taking responsibility for your actions and working on personal growth can help you become a better partner in the future, whether with her or someone else.