Wondering how objective I am being in this situation and would be grateful for an outsider's prospective.
DSS 12 lives with me and his father FT. Mum gave my DSS up when he was around 4 to the care of his father to pursue her career, but is in regular contact with him, albeit seldom sees him in person. Some years she's seen him just 4 or 5 times the entire year, more recently it's a little more frequently (once every one to three months). We won't know about her visits until the night before or on the day. We also won't know how long she intends to have him (hours or days) until DSS is on his way back home. DH has a court order in place but she has never abided by it. She doesn't financially contribute to my DSS's upbringing, apart from buying him designer clothes, but promises him a lot (including private schools, private tuition). My DH even paid for DSS to go on holiday with her.
Last year we noticing that he was spending more time on his phone, but also that he was deleting his internet browser history on his devices. We placed a parental lock on everything and started checking his messages periodically. Soon after we noticed a message from his mum accusing him of not caring about her. Looking back at their conversation, there were messages where she berates him for not picking up her call, for forgetting her birthday, for ending his visit with her short so he could attend a school event with friends. My DSS was pleading and apologetic in all his responses.
Also last year, we discovered DSS was worried about his mum who was claiming to be too ill to see him. This went on for months. More recently she's claimed that she was awaiting surgery, and after DSS sent her well wishes etc, she messaged him to let him know the surgery was cancelled.
She messages or calls most days. Tells him she loves him, misses him. She has a pet name for him. Talks about how much he means to her and they're going to be together soon. It's relentless.
Now the issue is my DSS who is confused, often down and withdrawn, lacks confidence, and focus, is struggling with his school work. I've suggested to my DH that we regulate visits and his phone contact (for example phone access 3 days a week to catch up with her messages and calls). But DH says we cannot force her to see DSS more regularly, and doesn't think limiting phone contact will be helpful.
Is mum being emotionally manipulative? Shall I leave his parents to it? Am I being objective and reasonable in my assessment of the situation? Thoughts appreciated.