Dsis and BIL married 25 years 2 DC 1 at uni 1 just moved back after uni. 8 years ago BIL left dsis for OW. After 6 months he asked to come, several months later she agreed. 3 years ago she discovered what she believed to be emotional affair with same OW. I was supportive of her, but had hoped she would throw him out. She didn't.
Last weekend she discovered another full blown affair. I know it is very early days but she seems to be looking for reasons to allow him to stay. I am really trying to just be supportive and reflect back her thoughts and feelings. Problem is although I am mad as hell with BIL I am also start9to feel a big angry with Dsis.
So my questions are, how can I best support my sister, is it my place at all to try and influence her decision and why do I feel angry at her?
For context she did not cope well emotionally when he left 8 years ago, but as far as I am aware could cope financially on her own.