Only God knows what each trial is for. In any case take all trials as an excuse to improve things in your life. I do not think that an Orthodox woman will says "no...I do not want to be with you because you are sinful" ..things are a bit complex than that. There are so many reasons why an Orthodox woman would choose to or not to be with you or anyone in general. We are all sinful. As long as we are not talking about major sins, addictions and things as such...but then again there isn't a man who has succeeded in figuring out what a woman wants so I wouldn't strrss about it as much
Each relationship is different so it is difficult to say what a woman might find faulty with you.
Cheerios Mike and try to be less hard on yourself. Enjoy the good things that God has given us.