Sometimes, neither of you is truly wrong, and neither of you is truly right. We all have our own opinions, and so long as they're reasonable, there's nothing wrong with having them. We shouldn't expect to get our own way all the time, and much as men love having a woman to treat as a Queen, they shouldn't have to serve her like a peasant!
There will be times when you just have to roll your eyes and meet him in the middle. This could be on tiny things on what to do on the weekend, or something as big as buying a house. If you're in it together, then you have to reach decisions you're both happy with, and sometimes that means you have to give in a little. He has to do it for you, too - it's a two-way street, but if you insist on holding out for your own way every time then why should he? Give a little, take a little, and learn to be happy in the middle.