Needed to hear this now more than ever. The reason they chose you is because you are a good person. But never regret being a good person and don't stop being a good person because you have been burned before.
Life is kind of like a party. People come, others bail. People contribute, others mooch. But as the night comes to an end, after all is said and done, there are still those people who will help you clean up the mess- the mess they never created.