How can I forgive myself after a breakup I caused by lying?

My ex broke up with me last year, and I’m trying to get back out there but the one thing stopping me from that is I can’t let go of the self judgement I have from causing her to break up with me. Would rather not get into specifics but basically I lied to her about something and then got involved in some friend drama…point is…I can’t forgive myself and it’s making it really hard to move forward with my life.
How can I forgive myself after a breakup I caused by lying?
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