I have never involved myself in someone else's relationship, because i'd never want anyone to try to involve themselves in mine - simples.
HOWEVER (this could be pregnancy hormones on my part), my partners friend recently broke up with his partner who has a child under 5, and although he is not biologically the childs father he has been there since he was one, and has raised him as his own.
Unfortunately he found out his partner was cheating on him, he tried to get past it, he stuck around but they were just bickering. She would throw abuse at him about how he doesnt trust her, that she's a slag etc and tell him to just get over the fact that she cheated on him. He works, she doesn't - so there set up relied on him injecting extra income to support them, she depended on him to transport her about etc, normal in many relationships etc.
Now she's regularly posting on facebook about how her child 'is so upset' and it 'breaks her heart' the situation she's in, how people dont understand that depression makes you do 'bad things' but not actually clarifying to a soul that she cheated on him which is why he left. All the while slagging him off to her friends - he however, has told practically no one and is devastated.
AIBU to want to tell her to get a grip? She betrayed her boyfriends trust, a man who was never obliged to step into the shoes of being her child's parent, but did and loves that child like his own. She is using emotional abuse, and has an excuse for all her behaviour, while she goes around sponging up sympathy and telling lies about a man, who i know to be a genuine guy. Thankfully he's wised up, and he knows he deserves far more respect and to not be taken for granted, but he misses his 'son' more than anything. RANT.