SUBREDDIT: r/relationships
TITLE: [21/f] w/ bf (22/m) that values communication and the truth, but should I bring up things that have the potential to break things off when it may just be me being too sensitive?
POST: It's the first time I believe my boyfriend and I are actually having serious issues. We've been together for almost three years now. Mainly, I think it's because we're both entering the stage in which we're viewing the other as more serious than just long term relationship and more of a long, long term relationship. 

Originally posted this in /r/rants[1] [1], and then /r/relationship_advice[2] , but would really like some more feedback and opinions/insight.
TL;DR: 
How do I know if the little things that used to only slightly bug me but are now recurring more frequently and causing more serious thought are actually major deal breakers?