<human>: Can you give me the gist of the text in a nutshell?

We've been together a year, essentially living together for most of that time and have bene officially living together (with a roommate) for the last 2 months.  Starting around the time we started apartment hunting, we started having issues in the form of frequent arguments.  

After approximately 1.5 months of having these issues, when trying to address them, my boyfriend told me that he is no longer 100% certain that I'm the one and that we will end up together and getting married.  He says he wants to want those things and still loves me just as much, but the certainty is no longer there.

We've been working on the things he says he needs to see change for him to feel certain again for the past few weeks.  He acknowledges how hard I have been working and how it's making things better and yet, he is still not sure. 

I know that things will take time but I am finding it excruciating to deal with his uncertainty.  I feel insulted that he changed his mind about me and constantly anxious and scared that he is still unsure.  It feels like it took very little to shake his certainty and yet, it is taking a great effort to reestablish that certainty. 

Is there a way to better address this situation?  Is it a hopeless situation that cannot be fixed?
<bot>: My boyfriend of a year used to be sure I was the one and that we would get married...after a brief period of relationship issues, he is now unsure and I don't know what to do.