You can't change your situation but you can change your attitude in how you decide to see it and take the actions from there that's beneficial. Choose to be positive, find strength, be the better person. Be the better you.
For the English speaking folks this wonderful and very true quote: "Sometimes you just need to stand up and leave, so the person on the other side of the seesaw falls on the ground and notices how you have been carrying him/her." - by RUMAG