Well we have no ways of really knowing why people do what they do. You may never get an answer. But we do have control over what we do and try to understand why we do what we do. I recommend to find a therapist if that’s possible in your area and explore your own behaviors and look at the root of it. What kind of relationship you have with your parents?

As about what to do with this guy. He hasn’t seen you for two months. At this point harassing him with calls and texts isn’t going to make him interested. Why do you want him to block you? He isn’t the one suffering. You are suffering. So block him. Sure you might not get your money back but you likely won’t get it back anyways. He is a user. A decent person wouldn’t take money from a girl he barely knows. You can put a stop to it by blocking him and finding someone who is interested or enjoying your life single