Every relationship has it's breaking point or make it or break it point. This point in the relationship can be very trying and hard. Therefore, only the strong relationships will survive the storm. I am not speaking of a time when your not getting along with your mate or your fighting all the time.
The breaking point normally comes when everything is great between the two of you. The time when your so in love with each other. For example when she gets pregnant and you can't wait until the baby gets here, than it's here. A child will make or break a relationship because I have seen it happen many times. However, some people are able to weather the storm and get stronger as a couple.
There are things that bring a relationship to it's breaking point. These things can very for different couples. Things like a death in the family, a new baby, cheating, the new house, losing a job, or someone getting sick. When things like this happens in your relationship this is when everything hits the fan. If your not mint to be together this is when it will come out. This is when love is not enough.
There is not much you can do about the outcome except be honest with yourself. Try to listen to your mate so that you know what it is they need from you. These are the times that we get selfish and distant. Try to be open minded about the situation and consider all avenues.