If someone suffers with mental health problems and have different things that they struggle with in particular, but are very open and honest about that at the start of their relationship..if they ever behave in a way that is wrong - but they accept that afterwards and own it and apologise etc etc.. they never excuse their behaviour, however they try and explain it to try and make their partner understand a bit more and they try and make them learn about it. They are really trying to make their partner see that they don't mean any harm or hurt etc.. if their partner doesn't understand and struggles to handle this and finds it too hard or difficult or challenging etc ... Then rather than them going about that the correct way .. if they choose to instead act abusively towards their partner and treat them badly or react badly to them and then turn around and act like the victim and that they've 'had it hard' etc.. is this acceptable or excusable ? Can they treat their partner badly but then blame their actions on finding their partner hard to be with in the first place?