Glad you left that @abracadabra1980 .
Speaking about emotionally unstable, what ties together so many unpleasant men is the way they usually try to make out that it's their female partner that's emotionally unstable, mostly because they want to deflect attention from their own behaviour, and also as a manipulative strategy to make the women doubt themselves.
Sexism goes a long way in ensuring that men do not think of their sex being capable of being moody.....as every emotion they have is important & legitimate, whereas as women's negative emotions are all unreasonable, random and a result of our hormones.
I forgot to say OP - there's a certain stage in an unhappy relationship where you just can't rely or believe someone any more when they tell you they love you. Yes they could be lying, but there's also no way for you to truly know what love is for another person, and how they're actually feeling. So, if they're behaving in a way towards you that is unloving, disrespectful or frightening, then that can't be ignored.
I once didn't really realise that nasty abusive people who have contempt for their partner don't always want to get rid of them. In fact, they want that person to stick around, to be their life partner because they know they won't easily be able to treat another woman like shit again. They want someone they can bend and control, someone they can extract the maximum amount from.