I've been single for 4 years. I'm 24 next month. I've had my chances with some great looking girls that were not so great inside, and with some great girls that were not good looking. In most cases, I declined anything other than friendship. Now I have new friends that are worth more than failed relationships. Now one of theose female friends has a buddy who I am actually interested in. Will this new relationship lead to marraige, happiness, whatever? Who knows? But I waited till I found what I felt was right. It is worth it to be picky. You should give yourself the best that you deserve and don't settle for second best. As for faithfull guys, we do exsist. Another good piece of advice is not to be discouraged by one failed relationship. It might happen first try, but finding the right person usually takes time, trial and error. It's ok to casually date, with no commitment(as long as that is mutually agreed on), that way you can test the waters before you dive in head first.
Keep your head up!!!!! The good guys love confidence, and the bad ones thrive on weakness.