3rd miscarriage

today I had my 3rd miscarriage. it doesn't get any easier, though I thought it would. I knew all week it was coming. so many people tell you not to give up but I cant help but wonder if I'm just setting myself up for more heart break if I continue to try. I'm already to the point where I am so jealous of every other woman whose able to have babies. I'm fortunate to have my son who's 8. I thank God I was able to have him, problem free. he is my strength. I just wish I could give him the little brother or sister that he wants so badly. why does God do these things?!?!?!