I’ll try to keep it short. My partner of 2 years told me that my sister had messaged him to meet up when she was drunk. He told me during an argument - he was spending a lot of time at my house and I needed more time to myself and wanted some time with my adult children. He struggled with this and wanted to be at my house and sleep over 7 days a week / this led to resentment on both sides which impacted on our relationship. Back to my sister…. I later found out that she had told my mum and another sister that he had been messaging her to meet up. He denies this and says he only messaged her re birthday ideas etc. I’ve never had issues trusting him. My sister is frequently over familiar with other peoples partners which has created issues in the past. She drinks a lot and is lonely. My other sister or mum didn’t come to me to tell me. Neither he nor my sister have the messages. He says he loves me and it was wrong not to tell me but he didn’t want the drama as we were struggling to get along. This was about 6 weeks ago and he’s been seeing a counsellor. My adult children used to like him but now think he’s an ae. I feel hugely let down by all 4 of them. I want nothing more to do with the sister involved and my mum has made it all about her because I was upset and angry when I went round the day after I found out - so she / my mum is now the victim. I’ve tried to tell her that she’s hurt me but she left the room saying she didn’t want another shouting match. She’s always behaved like this and will cry or sulk to avoid taking any responsibility. It’s all a huge mess and I can’t see a way forward. I’ve been angry for 6 weeks and have refused all attempts to reconcile with him. Before all of this we would fall out a lot - the root cause being resentment over him feeling rejected and me not feeling like he respected my boundaries - he would regularly pack all his stuff up and tell me we were over. We got together during lockdown so we were in a ‘bubble’ for the first 6 months. Other than that we got along really well and had a lot in common - but got into a viscous cycle. I miss him but can’t see how it can be resolved. I’m 51.