OK, so saying we now "hate" it is extreme. But those characteristics can drive us wonky. Why? I am no expert (well, I am kind of. I have been married for decades), but I read something several years back that made sense of it for me. I wish I could remember where I read it or who wrote it because I would like to give them credit. It has helped me understand and hold my tongue on many occasions during our marriage.
When we fall in love, we tend to look for someone who has strengths we don't necessarily have. Usually unconsciously. Hence, the cliche "opposites attract" (this is far different from having opposite morals or interests, which can hurt a relationship). That is because it will balance us, make the unit a whole. If we are afraid to voice our opinion, we find someone who can gifted. If we beat ourselves up with guilt over never getting enough done, we admire that fact that he/she is relaxed and laid back. If we have trouble asking others to help us, we find him/her great at delegating. If we are wall flowers, he or she is the toast of the party.
We fall in love; time goes on. Now that person is a human instead of a god. All of a sudden, "gifted" becomes "opinionated". "Laid back" becomes "lazy". Forget "great at delegating"! They are just plain "bossy". "Toast of the party"? They are a "show off"! Those very qualities we love turn into warts we would like to burn off.
If we keep that in mind, all of a sudden those traits are not so irritating. After all, those things are the very reasons we fell in love in the first place. Keeping that in mind gives the person we love permission to be the person they are. Remember, they fell in love with your for your characteristics. Those characteristics are as foreign to them as theirs are to you. You drive them crazy for the same reasons. Isn't part of love acceptance and admiration of what the other truly is?