I have an issue with lying after splitting in relationships. When my partner confronts me about something, I immediately go into a mindset of "any mistake is a fatal one," and will (more than sometimes but less than often) lie to try and avoid this assumed outcome. I'm never successful, it's always at the absolute worst times about the worst things, and I come off as a malicious and severely disingenuous person. It has wreaked absolute havoc on my relationship with my FP, the most recent example being this morning, and I believe I may have lost my FP as a result. 

Do any of you experience this as well, and how do you deal with it? How do you break the cycle of behavior? I'm so low right now, but I need to know this because I am so tired of destroying my relationships with people and my FP.