In the beginning all relationships start out on the very best terms.
We usually groom ourselves th best we can, act on our best behavior, become more tolerant to issues that bother us, and are just an all around more easy going person to be around.
However, this doesn't last forever.
As we settle into our relationship the person we were starts to creep back into our life.
It happens to the best of us.
Unfortunately, the person you tried to win over with your better self may be disappointed, and it may lead to confrontations, arguments and in worse cases, a complete break up of the relationship.
If your relationship has been split up due to constant arguing that seemed to start after you relationship's "honeymoon" period, then you may want to look at how you and mate have changed since then.
Remember, there will be change.
The fact is, one of you changed and the other doesn't like it as much.
You should try and identify what this change was and if it can be corrected.
I'm not saying return to somebody other than your true self.
I'm just saying that relationships take work.
If you found the love of your life and in order to keep them you need to be a little more tolerant or communicate more or whatever, it's well worth it.
The key is to identify the issue, and once you find the problem, overcome it.
Remember, small changes can make big impacts, negatively or positively.
Make sure you're going in the right direction.