Brief History: didn't grow up with brother because I was in care and he was at boarding school.
I was taken into care due to my mother's neglect and my brother's threat to overdose me and kill himself - he was 15 at the time. Mother has a diagnosed personality disorder and is totally toxic and evil. Will never see her again, neither does my brother.
Had brief contact with him during the early 80s. He visited our mother for as long as he needed to in order to get his grant applications signed, then did a bunk leaving me to look after her until I couldn't stand it anymore.
Got back in contact in 1998 and we were fine up until I got married when his wife was horrible to me all day and I became upset and depressed after the wedding due to their behaviour. My brother was okay, but he stood by and let his wife treat me like crap 
That was in 2003. I haven't seen them since. Didn't bother contacting them again and moved house. They did send a greetings card about a year later asking where I'd gone and what was up, but I couldn't face doing anything about it. I can't stress how let down and depressed I felt.
I have been taking antidepressants and having CBT lately and feel much better. I do miss my brother and it was his wife's fault that I didn't see them anyway, not really his. He's okay, just a bit gutless.
Do you think I should get back in contact or just leave it?
I don't know what to do. I don't feel that I should apologise as such because I was the wronged party, but don't want to go in with all guns blazing and accusing his wife of being a heartless bag or anything.
I don't really know how to approach him.