<human>: Give me the gist of the text in a nutshell

Title really says it all. I'm a pretty happy dude just living my life. I have a really enjoyable job, my hobbies are really fun and rewarding, I'm in great shape (climber and biker), and I take care of myself. I've done graduated university, traveled all over the country... I'm honestly really satisfied with where life has taken me so far and I'm always looking forward to the future.

My social life is going pretty well too. I have a few good friends I see a couple times a week, and I always hang out with my family when I can. But romantically, I'm pretty lonely. I had about a year long relationship when I was 18, but since then nothing ever lasts longer than a couple months.

I've dated about 5-6 women in the past 5 years, and they are all pretty awesome women (and I think they are all really attractive too, of course) but nothing ever lasts. Mostly they end it, sometimes I do, and sometimes I have women come on to me but I'm not interested. 

I'm not really sure what I'm doing wrong. Nothing really ever ends on bad terms, we just wern't the right fit (not the right timing too sometimes). I'm not creepy, not clingy, and I'm always 100% honest with the women I see. I've dated women from my classes, tried online dating, and from my social pool. Nothing seems to last and I'm honestly a bit confused. Is it me or them, or have I just not found the right person for me? Maybe I should lower my standards?

Do any of you all have the same problem? How do you all make relationships work? When did you meet the special one? I feel like I'm just getting older and older, and while my life is awesome, I'm just a bit lonely and would love to share my life with someone.
<bot>: I'm a happy, successful person but I can never seem to make relationships work. What are some tips for successful dating/relationships?