Most relationships do not last because of the following reasons:
1. Unpreparedness: Most people go into relationships having no clue on what to do to keep it going. It's one thing to fall in love, and another thing to be in love.
2. Immaturity: in this situation understanding and the ability to compromise or sacrifice is lacking. Immaturity in the sense that both parties are insensitive to the plight of their partner and at the same time not knowing the right thing to do even when an opportunity presents itself. With maturity comes knowledge, and where there is knowledge it is easily to understand the strength and weaknesses of your partner.
3. Not wanting it enough: I stand to be corrected but i feel a relationship would last as long as you want it. The issue most people face in their relationship is that they are the only ones willing to commit and put in effort to make things work. It takes two to mingle they say. Conscious effort must be made by both parties to bolster their relationship.

This, in my opinion are the three main reasons why relationships don't last. What do you think?