I need advice, my partner of nearly 3 years split from his child’s mum about 4-5 years ago, she is still obsessed with him and insists on ruining our relationship and his life, she constantly rings kicking off and goes on about him being with me and then sends me messages about him and making lies up to split us up, his mental health is so bad right now to the point where he can’t hack it anymore and I don’t know what to do