The problem...

The problem with must relationships is the seven sins. this is going to become is funny since i relate to religion for a second to bring up the seven sins. Which are Pride, Wrath, Envy, Sloth, Avarice(Greed), Gluttony, Lust. Most of these is the reason a relationship can never work out.

Pride:
The pride of a person too be known as someone or to see recent people can cause a person to avoid dating a recent person; of wealth, looks, weight, boob size, penis size, intelligence, and many other things its not hard to think of. There pride would not allow them to be seen with this person even if they where the nicest person and the world. Causing i fatal flaw in the relationships. It is also know as being shallow or going for people's looks. This is there pride. If there is no pride tho you will allow yourself to be walked on and pushed aside.

Wrath:
This is simple, the wrath of a person effects the relationship greatly. Thinking about some one who gets angry easily and lashes out at people. That would cause pain and harm so people would not want to be be around that person. Yet a person that is too calm and has now wrath or keeps it bottled up, makes people think your are calm and likes you but could never think more then that since you not showing such emotion.

Envy:
The people like every sin here you need balance in your life. A relationship is a two way street. IF you ever make it one way it will fail. For the reason is that if you only become envious of the person and only see what you want from them in your character you will not see what you already have in your character that people like about you. You will not see it. Causing yourself to become low of self esteem. Yet it is nature to do envious of others that wants pushes us forward in life.

Sloth:
This sin is different everyone thinks about being lazy is bad not matter what. Which is true that being lazy can be bad. It shows lack of interest, caring, and motivation. which is bad, with out any of those of course in balance you would do nothing and waste life. Yet without being lazy at some point we would all be workaholics and over worked to the point where can not function. You need to see both sides. Once again every thing in balance.

Avarice(Greed):
Well i am sure this one is very blunt, at least for the negative side. You want what you can't have, you will throw away anything you have for something you can never grasp. Too many people do that in a relationship leave one person to try to have someone they know they can't have or get yet want. Avarice(greed) is a very powerful emotion since it is very easy to be greedy. In your culture it is pushed on us that we deserve the newest, best product out there. It is hard not to be greedy in todays time. Yet like envy with out a little greed we would never push yourself forward.

Gluttony:
hmm the sin of eating xD, no the meaning of gluttony as a sin means addiction. Addiction is bad and normally to end one addicting you start a new one.most addiction you think about are drugs, which will cause problem in a relationship even if they both do drugs and are addicted to it. What a shocker eh xD. Yet there is the addiction to a person, which is bad because once addicted to a person . Well each person act differently. There actions could be as simple as trying to help them out when every they can to trying to look like them or stalking them. Even throwing away there life to be apart of theres. None of that is healthy and will never help a relationship. The positive thing about addiction... i don't really have one. I guess it shows you care for something more then yourself, that you have the motivation to finish something you started. How ever it will end. (if you have read this far and you have a positive thing for this please comment)

Lust:
Well Well my favorite sin xD. The physical attraction and enjoyment of two people doing well dirty things. The two must common ones, are cheating and rape. Now to refine that cheating doesn't really need it. You are committed to one person yet you have sexual relations with someone else. The one i want to refine is rape, there is the one that is like a no brainer which is against the will of two people that have no relation of that time. where there is also rape in the sense of couples where some one feels pressured to do something and doesn't want too. either way both these ways are bad. It will never help a relationship. Lust is sexual attraction so again like everything in balance, IF you move slowly and with your partner and never force anything. A trust us formed and you should be able to fill your lust with your partner.

The end fact is that balance in you life is needed. The seven sins are good and bad for your life it is all about balance.