the more public he makes their relationship the more she feels she has to stay in it or she appears like a monster, she probably wants to leave but is afraid of backlash, this is how women were kept in line before feminism.
Women from my experience lack empathy, true empathy, they feign empathy in that they will pretend to act caring and nice only if a group is watching, as soon as public exposure is gone they act for themselves. It's like their makeup, they need to constantly appear beautiful and at their best to impress but the makeup is not really their true demonic form.
TLDR: Keep making this public and she'll have to stay or appear like a complete monster