DSis ended a 14 year relationship with her partner 3 years ago. They had been together since they were 17 and considered each other soulmates. However, to cut a long story short it transpired at around the time they split that her ex-DP had been (in my opinion at least, and I think increasingly in hers) quite verbally/emotionally abusive for a number of years. For example, he would tease and put her down a lot, go on endlessly about fancying other people, wouldn’t let her wear perfume, make-up or certain clothes (insulting her and refusing to go near her if she did). I could go on.
Anyway, DSis is currently single, happy and independent, though would like to meet someone. Last month, her ex-DP has moved back to the city (he went abroad for three years after the split) and wants to get back together. She is very tempted. It sounds like he has done a lot of soul searching and is saying all the right stuff, genuinely realising how awful his behaviour was, promising that he has had a lot of time to change and would never, ever be so horrible to her again. Do such changes often happen? I assume people can change in this way? They clearly still have a lot of feelings for each other, but I’m really nervous for DSis in case the same happens again.
Many thanks in advance for any thoughts about this. I'd like to be able to support and advise better than I feel I currently am (I don't really say much, just try to listen openly).