Relationships can take us to the heights of passion and the depths of despair. There are days we look at our partner and ask ourselves how we got so lucky. Then there are occasions where we can't stand to be in their presence, if temporarily. Nevertheless, relationships entail taking the good with the bad. It doesn't mean you have to settle for less, or let the other person get away with everything. Nor does it mean expecting them to be flawless or of like mind in every way. Here are two musts in order for a relationship to be successful: 1. Appreciating each other's similarities.  Maybe you're both rabid football fans, hardcore comic book geeks, or the biggest Beatles fans anywhere. Or perhaps you're both optimistic, financially responsible, or averse to rollercoasters. There's no question that in order for the relationship to run smoothly, both partners should have some overlapping interests, fears, views, or all of the above. Otherwise, yo...