When a woman is upset, give her food, sex, cuddles, and listen. This solves 99% of problems. If it doesn’t solve the problem, you REALLY fucked up. From How I Met Your Mother: “True love means wanting the best for another person. Even if it means you’ll get left out.” Sometimes, it’s not your turn to solve a problem, even though you might have caused it. When she needs it, give her the space to talk things through with a friend. Move over and surrender to #3.
If failure doesn’t kill you and you are not being eaten alive, you are fine. Keep going. When life feels like you can’t go on, it usually just means you can’t go on that particular path anymore. But you can always turn left. Or right. Or back. Your life’s not a highway. It’s all off road.
You will succeed only if you are able and willing to fail. I once told a girl I had feelings for her knowing full well that it wouldn’t go anywhere. From the first second it was clear that the outcome would be failure. Going through it regardless felt like a success in itself.