You may think that you all fit perfectly and you don't need to avoid or accept stereotypical norms in your relationship, but there are a few things you should avoid saying.
Comments about his mother: It's not uncharacteristic for a girl to not get along with her guy's mother, but take the smarter way out and avoid making any personal comments about her.
His friends: So you find one of his friends cute, in a very platonic, complimentary way of course, but you don't need to throw that on his face. He might take it the other way round and things could get messy.
You're doubtful about his dreams: Being his partner means understanding and believing in his dreams and extending support whenever required. If you can't be extra-supportive, try not to belittle his dreams either.
Calling it quits: Arguments are part of relationships, threatening to leave after every little fight is not the wisest thing to do. This almost seems like you're constantly looking for excuses to leave even if you're not actually doing that.
Your salary: You may both be individually secure, but this can be a dangerous area even for the most sheltered couples. Tread this particular area carefully.
BDST: 1339 HRS, SEP-16, 2014