I just don’t know what to do 
I’m at my wits end with my partner’s ex.
This week it really feels like the straw that broke the camel’s back and I just want to leave so I don’t have to deal with her anymore.
Just to be clear I love my stepchild and this nothing to do with her.
Would I be unreasonable to put my happiness first and leave my partner of 8 years and therefore I don’t have to have any contact with this woman ever again? It sounds like an extreme move but I just can’t cope with another 8 years of this.
This week the kids went back to school and my son who has Autism was being very difficult on the morning that my stepdd was going back to school. She goes to high school so started back a different day. I was dealing with my son and it got to the point where I had missed the opportunity to get a back to school photo of stepdd. I felt absolutely awful as it only takes a minute or two to take a photo, so I phoned her, telling her I will get a lovely photo of her when she gets home from school. She understood and I said I was so sorry. It looked bad though as I had taken a photo of my children the day before when they went back to school. Anyway I got the kids to school and then received a message from her mum asking if I’d got a picture. I apologised and said no I didn’t and that I’m really sorry, and explained why.
Anyway, she went crazy at me and accused me of treating her differently just because she’s not mine. It absolutely isn’t the case at all
She said I spared no thought for stepdd when in actual fact I did and had every intention of getting a photo just like I have done in previous years. If the same occurred when my children went back to school I would not have got a photo of them either. She of course doesn’t believe that for one minute.
I was in tears when I got home from the school run. I was exhausted from the morning I had just had with ds and then felt like a really shitty person about the photo which was not intentional. Her mum wanted a morning photo and any other photo isn’t the same.
I’ve felt really down ever since Wednesday. Questioning everything about my life and whether I want to put up with this for another 8 years. My partner loves me and I love him, but I really can’t do this anymore. I’m nearly 30 and the clock only goes one way.