Being reckless with the hearts and emotions of others, and betraying those that have given you their trust is one of the wounds that cut the deepest. I'm sorry this happened to you, and I'm sorry it happened in this community. It's fucked up, and you have every right to the hurt it's caused you.
What this says to me is that you're a good man, and you did what a any good man would do. And unfortunately, there are people in the world that manipulate the genuine intentions of others for personal gain, which can leave the Givers and Helpers of the world cold, callous, and jaded.
I say fuck that noise! Refuse to let the uglies in this world steal your sunshine, and continue to put yourself out there by helping anothers in need. When things like this happen to me I try to (eventually, sometimes sooner than others) use the experience to make a better version of myself, and the best me will always take the risk.
I'm sending you all the virtual hugs right now. And, if no one's said so today, you're a good person and the world is better because you're in it! XOXO