I deeply disliked being single and was so for most of my life.
As of late, however, I have been in a relationship that often makes me quite happy. Its not perfect - she is significantly younger than I am, for one thing, but in spite of all the difficulties, I find that it is very fulfilling and completing.
Ultimately, all relationships just really need the fundamentals of trust and communication to them. Quarrels and fighting aren't necessarily bad signs, especially if they're over legitimate differences, as they can lead to better understanding.
I also think that one of the partners needs to be dominant and be able to have the last word. Having some sort of a firm direction is a very good thing, and while its incredibly important that both partners respect each other, I find that both I and the girl have come to appreciate how irrational or uncertain she is feeling, I can make a good decision for the both of us.
Regards,
IO
PS: As others have mentioned, it is a major responsibility - at the very least taking up as much time as an additional evening job.