One important area in a relationship is how compatible you are with that other person. What exactly is compatibility in a relationship?
Compatibility in a realationship is how well two people get along. Do you like the same things or have the same views on certain things? If you do then you are compatible.
It's okay to disagree on one or two things. After all no one is the same and you are never going to meet someone who is 100% like you. If you have nothing in common then that could be a problem.
If you love to laugh then you should be with someone who is laid back. A person who loves to joke around shouldn't be with someone who is always serious. If one person is romantic they can't be with someone who isn't because the romantic person wants romance. Someone who is sensitive and caring shouldn't be with someone who is rough and demanding.
What about opposites attracting? If you can't find a common ground then you two shouldn't be together. Relationships are about giving and taking.
If you feel that it is hard to talk to the other person or you can't agree on anything then that could be a problem. However if you really love the other person you could work through it. If one person does not want to work on it then it is time for both of you to go your seperate ways.