Bf and mum

Before me and my bf got together he told me about something that happened to him when he was travelling that summer and it was really difficult to hear. I’d love to talk to someone about this privately but I don’t want to say what happened to him on this. But I didn’t know how to handle what I heard at the time so I told my mum. My bf knew I was doing this and said it was okay if it helped me. My mum was horrified and said the fairytale was ruined and it took her a long time to come around from this. She reassured me at the time she would judge him on how he treats me and so I proceeded with the relationship. However, if she disapproved I couldn’t have continued with the relationship. I forgot all about this for 10 months (we’ve been together 10 months). My mum seems really fond of my bf and I haven’t worried about any of it. She always makes of him in the house.

When I was on holiday recently me and my bf had an argument and this situation came up again. It’s a long story but that’s the main thing. I told my mum about our argument. My bf didn’t know this. But I needed support at the time. It’s all okay now but the situation being brought up again has resurfaced anxiety of my mum not approving. She made some comments about the situation like that she swallowed down a lot. I’ve pleaded with her to reassure me that it is all forgotten about and in the past. She said she has reassured me but I don’t feel she has. So I’m stuck in this thought that she doesn’t like my bf. It’s making me feel so worried and uncomfortable. I have ocd so she is saying I’m now having an ocd thought regarding this and need to sit with it. But how can I sit with something this uncomfortable? I need to know she supports my relationship.

For context she is always lovely with my bf when he’s at the house and really has built a relationship with him. His graduation is this week and she’s bought lovely presents and she collected me and my bf at the airport when we got back from our holiday and was so excited to see us. I love my mum. But I need to know she supports us. Does all the evidence suggest she does? She also tells me to look for the evidence. I don’t know what to do with this thought. My bf really over thinks things so I don’t want to bring this up again with him and make him think my mum doesn’t like him, I’m trying to protect him. But I feel at a crisis point.