What do you think makes a good relationship?

I think my boyfriend and I have the best relationship. It started out as just good friends and then a month later we were dating. Five days later my sister passed away and he was there with me through the whole thing. I think one of the reasons that I love him so much is because we NEVER go to sleep angry and always talk things out… We have gone through some of the hardest things that couples will ever have to go through… what makes a good relationship for you?