It's a hard question because I'll think of ten things that do really matter to me by the time I post this... okies, here we go.
1. A stable personality... that comes out that way, if you say six different things depending on your mood we have a big problem right there, I need to know where someones really coming from without having to read between the lines or compare all your statements and guess which one is the overall truth.
2. Honesty everywhere it really counts, if you're lying to me to hide something, trust me I know what the truth is and now you're not only an XYZ but also a liar... I can forgive, understand live with a lot... but if you lie to me about it that is actually like, two strikes every time.
3. Can discuss even a heated difference like an adult, if you deflect, never own your actions, blame everybody but yourself etc etc. yada hey or resort to a nasty personal attack because you've bullshitted yourself into a corner then just do yourself a favor forget it before you even open your mouth...
I'm a very forgiving and understanding person... and I've actually put up with and ignored some of this shit more than I should have, but I've been around the block more than twice, and I just have lost all tolerance at this point in my life for the bs. (and I was right, I could go on and on about now, lol