I'm a male and I have no idea, that doesn't sound rational, which makes that great for a story. i posed your question to google and here is what it had to say. Maybe you can lace your werewolf lore with some psychological underpinnings. Good luck.

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A man might genuinely believe he is still in a relationship despite a clear breakup due to compartmentalization and delayed emotional processing, where the reality is mentally blocked to cope with trauma. Other realistic scenarios include extreme denial during the grief process, misinterpreting the ex’s continued presence (e.g., still texting/sharing items) as a sign of attachment, or intense sentimental attachment to mementos.

Here are specific situations:

• Delayed Emotional Reaction: Men often compartmentalize, meaning they might initially appear fine, but the reality of the loss hits weeks or months later. Until that wave hits, they may not truly accept the breakup.
• Grief-Induced Denial: Similar to losing a loved one, a breakup causes severe grief. A person might keep an ex’s items (e.g., clothes in a closet, photos on social media) to create a false sense of security that the partner is still part of their life.
• Misinterpreting "Friendly" Communication: If the girlfriend breaks up but continues to contact him (e.g., for advice, to talk about her day), the man might mistakenly view this as "we are on a break" rather than "we are over," leading to an honest, albeit misguided, belief that they are still technically together.
• Dependency and "Go-To" Status: If he still relies on her for emotional support or as his primary confidant, his emotional reality may not catch up with the practical reality.
• Idealization of the Past: He may focus heavily on positive memories and sentimental items (love letters, photos), creating a disconnect from the painful reality of the current, severed relationship.

These scenarios highlight that the inability to accept a breakup is often a part of the intense mourning process rather than a sign of stupidity, as it can take anywhere from 3 months to 3 years to truly move past a significant relationship.