So, you found someone who was ALMOST compatible with you, but not quite. Keep looking, the right one is out there for you, but you have to date 10 girls to find one even close. That's the average.
Good dating statistics on okcupid.com BTW. Don't know if you have to be a (free) member to see the stats. Okcupid has a very good matching system, I recommend it. And they have a free option. You get enough features on the free option that I like it. There's the occassional weirdo on there, but all dating sites have those.
I have a long time interest in psychology, specializing in relationship dynamics for 30 years.
(Please note, we give the best advice we can based on the information given in a post. For better advice, please include the age of all romantic partners.)