Hello,
I'm not sure how to handle the situation with my adult SS (19.5).
I always made efforts to have a good relationship with him (known him for 8 years). He doesn't have an easy personality, likes to tell people off, including me, but I supported some lack of respect in the name of a good relationship.
Well, I had issues with his mother who always "shared" with her sons ALL her problems. She basically decided to cling to my DP as his "family" and if I dared to communicate to her my dislike about some behaviours, she wouldn't hesitate to yell at me, then pretend to others that she was the victim.
Anyway, I did make an effort to have a good relationship with her as well after our issues, because I knew that her son firmly believed that his mother has to be "included". So for the past 4 years, I didn't have open issues with her.
A few months ago, during a family gathering, something strange happened when she didn't like something I did or said, she made a rude comment, I answered and I basically got kicked out of the house in front of my children and DP by a group of people (right before she was gossiping to them about me while I was 2 meters away). Yep, this has never happened to me in my life...Probably, alcohol was involved and she's menopausing and once told me that she sometimes feels anger mounting inside her super fast, so who knows what the hell happened.
So my SS who apparently was fine with me all these years wrote to me all sorts of things on facebook, enumerating everything he disapprouved of me, all my "failures" (this is how I realised that all this time his mother was talking behind my back as he knew things he couldn't have known otherwise). Apparently, he didn't like me and still doesn't like me ( I never noticed this). That I'm miserable, that I don't know how to have fun, that I'm the only one who doesn't get along with anybody, and what not.
His father talked to him, I'm not sure what he said, but it doesn't look like SS was convinced.
One of the things that SS accused me of was not letting my 4 year old son to talk to people I don't like. Honestly, it happened only once (the rest of the time I was silently supporting how his mother was covering my son's face with kisses) and with a person who has caused issues in my relationship (but SS doesn't know it and he liked that person). Of course, he doesn't see that when his mother "shares" with him and he stops talking to me and writes stupidities to me, he's doing exactly what he accuses me of.
Well, he didn't apologize to me, I sort of tried to seem normal the next time he came, but honestly, I'm not ok with pretending. I have the age to be his mother, I've done nothing to him and even to his mother, it was a not very nice exchange between us (both at fault) and I'm the one who got humiliated, so I think she must have been satisfied.
So now, SS who was coming to our house only about 3-4 times per year, decided to act extra nice with my 14 year old son (his step-brother). Normally, I would be happy that my son has an older step-brother who sincerely likes him, except that SS these past years was way too busy to have a relationship with him. He didn't even bother adding him to Instagram (there he has everyone else in his extended family) or congradulate him directly with his bday, so I feel that it's more to sort of use my son when he comes to our house. He loudly told him that he missed him and wanted a group hug. Usually, he just lays and watches his phone.
I'm torn as to what to do. I don't want to go to the level of my DP's ex and manipulate my children against SS, but at the same time, I don't think his behaviour should just pass without any consequence as he disrespected me, their mother, and he wouldn't tolerate a much smaller thing against his mother. Nor am I ok with him probably using my children to get their love precisely because he knows he disrespected me.
Also my DP doesn't feel good that I'm cold to his son and thinks that I should just let go, so that creates friction.