don't stress over this, I will say honestly when you broke up with someone, even if you want to stay friends, its always better to leave space between each other for a long time if after a month, you both moved on, you know it was for the best, if you both did not, well maybe there is still a spark somewhere.
It's normal that at the beginning, everything is all shiny and great and fun, but it is normal to get in the routine, get bored and to careless a little bit about each other, this is normal, on the other hand if you fight all the time its not good.
Don't stress on it, if its meant to break up, then let it be and move on, there is plenty of fish in this world!!!!!!!