You want to do things to please them because it makes you happy to see them happy, and also selfishly you are wanting them to do the same for you. It is not your sole purpose at all, rather it is just part of your day.

True, you commit to the one who you feel is the right match. You discuss the most important issues to you both over time getting to know each other to determine if the right match. However, you are also trying to work with what you have, because I doubt anyone will ever be totally the perfect match, people change, new issues come up, you just can't predict what may be a deal breaker down the road, but that is ok, not a reason to hold back from following your heart.

So much really has to do with chemistry. The importance of your gut feeling of attraction to a person physically and emotionally might be of even more importance than all the logic of how your personalities and values match.

It has to be mutual. It takes two.