You don't specify why you might be to blame. Do you have a bad temper? Are you impatient? Sarcastic? Demanding? Petty? Unforgiving? Do you nag? Whine? Snap? Sulk? Poor behaviour can take on so many different forms - some serious others less so, some easily reversed others less so - but without knowing where your particular foibles lie and where your personality lets you down (if indeed it does), it's hard for me to give you the relationship health check you're after.
But let me grab on to what little information you do provide; after a bust-up, the making-up is terrific. Well this is an excellent sign. There's still excitement and the potential for passion in your relationship, which bodes well for the long-term prognosis of your partnership. What's more, it suggest that neither you nor your boyfriend sulk or bear grudges, and this is another great positive. But on a less perky note, it would appear that either you or your boyfriend or both are alarmingly touchy - one small trigger and you 'fall', hurtling back into that ugly, quarrelsome rut you've been busy carving out for yourselves. So perhaps that's something you should work on first.
Be conscious of the trigger points, see them coming, and purposely break your behavioural patterns. So when the urge overcomes you to burst into a rage, hold your counsel instead. Stay with the feeling of anger, acknowledge it to yourself, taste it, feel it, then let it wash over you. Respond to the early stages of an argument by saying something different and unexpected. And if you can't manage: 'I hear you darling, you're obviously very annoyed with me for interrupting you in front of your boss - I was out of line,' try: 'So you think I deliberately humiliated you. I'll have to think about that.' Then check for the results. You may be surprised to see the calming effect it can have on a lover when we make a show of taking their opinions and objections seriously. We all need to feel heard and respected by our partners. Many disputes arise out of frustration and a feeling that our opinions are of little value.
One last point - and it's a snippet of advice I'd like you to pass on to your boyfriend too: try to be kind to one another. Does this sound almost too trivial to deserve a mention? Believe me - it's not. It's so easy to be rude, dismissive and intolerant of our partners but it never pays to behave with disregard towards the people we love. Relationships are breakable things, we should not take their fragility for granted.