This is, of course, a type that exists only among heteros.
Homoerotic doesn’t have a whole lot of interest in people of the opposite gender. This might be somebody with a deeply repressed homosexuality or somebody brought up in an extremely patriarchal environment.
Homoerotic always ends up in love triangles. Homoerotic’s partners are always married, engaged or partnered with somebody else. Homoerotic is an eternal mistress of married men or an eternal lover of married women. The reason why Homoerotic always ends up in love triangles is because s/he has a profound need to be deeply enmeshed with a person of the same gender.
Homoerotic will obsess about the wife or husband of the married partner and transform him/her into a central object in Homoerotic’s emotional life. To put it bluntly, Homoerotic wants to gain access to the sex organs of the married partner’s wife/husband through the only conduit Homoerotic finds acceptable.
Now you can answer the question of why cheating is much more rampant in, say, Russia than in the US.