I want to contact an ex after 1 year of no contact to try and make her realize that the breakup was unnecessary
Do you really want to get back together?
I want to tell her that I want a second chance. I think a lot of time has passed by since our last breakup.
It's understandable that you still care about someone you spent time with. Maybe it wasn't good timing before, and it will work out this time around. However, if she doesn't  feel the same way, you should allow her to move on.
Don't take it that way, you are making me angry. Don't you think I deserve a second chance?
It has been a long time and she may have moved on, you should respect that. Like she could have a new partner or kids. Sometimes relationships are not meant to be.