<human>: Give me the gist of the text in a nutshell

So I may come off as 'Douchebag Boyfriend' but let me explain. 

I had been in-love with a girl I had met in college after falling asleep in a New York coffee house and I knew she was the only girl I had wanted in the world. Fast-forward to two years later, a day after her college graduation, I ended up putting a ring on it, making sure I was committed to her, and that I would marry her, but unfortunately we had to wait due to the fact that our jobs were extremely demanding straight out of college and we didn't want to mess it up. So we had made the plan that once we had settled in, we would start making the arrangements for a wedding, which is now scheduled to be in the fall. There is just one major problem. 

Following a pretty massive blow-out with a client searching for real-estate, my girlfriend dropped the bombshell that she just wanted to be a 'Stay-At-Home Mom,' which was also huge because we never talked about having kids. I somewhat attribute this to her family uprising, being in a somewhat wealthy family and all of the women in her family choosing to not work.

While my job is financially stable enough (at the moment) to allow for this to happen, I have publicly expressed my concerns over this, simply because she had worked hard at a difficult university for 4 years to earn a degree and to let it blow away over one client was a bad decision. It has been a couple of months since she has stopped working and I have become extremely irritated with her but am having troubles expressing my feelings on the matter.

While I still love her, I feel that this attitude is a worrying sign for me and have pondered the possibility of dropping an ultimatum for the betterment of our own future(s). With that being said, I still have no clue what to do and need your help Reddit.
<bot>: fiancé had one bad day of work and quit working in-order to pursue becoming a stay-at-home Mom and I kind of want her to go back to working.