My roommate (who, like it or not, is basically my quasi-SO) and I argue a bit, but mostly our disagreements are settled through passive-aggressive snipes, snarky comments and then a shitload of passive-aggressive silence and avoidance (usually from me, not him).
How often do you disagree or just get irritated/annoyed with each other
Probably every few days. We're both rather irritable people, every few days I tend to either get pissed or get sick of him being pissed, and avoid him until both of us are done being buttholes.
How often do you argue?
Couple times a week. I usually don't care enough about anything to really argue about it when he voices his irritation at the little stuff.
How often do you have a fight, as in heated words, really angry with one another, blaming, etc.?
We don't, really. When the snarkiness reaches my tolerance threshold, I go into avoidance mode to prevent myself from being a huge bitch and saying things I'll later have to apologize for. I'd much rather apologize for being quiet and isolating myself than have to explain myself for my words, or an outburst of emotion.
Do you have the same issues causing disagreements, or do you usually solve it and fight about something else next time? Did anything change the frequency if fighting, such as kids, living together, time, counseling?
Usually similar issues. I get pissed off about my dog a lot; he isn't a dog trainer. He gives commands and doesn't enforce them. He is inconsistent, for example sometimes he rewards her with attention when she jumps up on him, other times he gets irritated and snaps at her to get away. I know he just doesn't fully understand the importance of consistency, and mostly doesn't care because most of his interaction with her depends on his mood and whether he wants her all over him, excitable and obnoxious, or whether he wants her to be polite and mild-mannered like I encourage.
I've just stopped putting myself in the middle of it and trying to micro-manage. My dog's behavior has suffered a lot, her house manners have gone to hell, but I pick my battles and generally let the two of them sort out their own issues now. If I get too irritated watching him screw with her head, or too irritated with her behaving in a way that I consider unacceptable, I just remove myself (and sometimes her) from the situation.
He gets pissy because I'm cluttered and chaotic and leave stuff all around the house. I smile and nod and try to clean up things when he complains a lot. He hates that I leave lights on and forget to shut the sliding door all the way. I'm sure I don't clean enough to appease his neat-freak tendencies. I dunno. Overall... We get on okay, for the most part, I think mostly we clash because of the fact that we're both often irritable and prone to overreaction.