I have a boyfriend for 6 years, he is married in Manila but working in the States. I spend money for him buying gadgets and promised the he will not leave me. But I found out that all are lies. He left me just like that. Is there a way to teach him lessons like filing charges against him?

Hopefully you're not holding on to the delusion that you're his girlfriend (as in the title of your post)... please let that go. You're not his girlfriend. He never wanted to take care of you and stick by you and he used you. Hanging on to revenge isn't going to help you move on with your life or find happiness. I promise!

You can't teach him a lesson and that's not your job. Your job is to teach YOU a lesson and to be more discerning in your relationships.

Let it go... life will teach him plenty of his own painful lessons and you don't need to get stuck in trying to punish him.

No, next time make sure you know someone before you invest so much into them. Lesson learned.