The reason for 4 is her own guilt. Admitting to being a cheating -I'll leave the next word out LOL- is too hard for people, even in the midst of their cheating. So they deny, avoid the truth, lie, all in the name of trying to feel good about themselves. Really not surprising. Anyone that would break the most sacred covenant that a human-being can take on this earth would be willing to lie through their teeth about it even in the face of evidence.
Sorry if this is too strongly worded about the woman that you still love, but truth is truth.
M(53), W(54),D(19) M-23, T-25 Bomb Drop - Dec.23, 2017 Ring and Piecing since March 2018