Domestic abuse happens in same-sex relationships and households too, of course. The public perception of domestic abuse is male on female in heterosexual relationships - which is all too commonplace - but female on male abuse and same sex abuse is common too, just rarely talked about and publicised.
A common tactic of the abuser/perpetrator is to portray the victim as the abuser and themselves as the abused. This is exactly what Will is doing - very devious and manipulative.
I can only imagine that this story line won't end well.