AIO of being taking advantage of?

I’ve been dating this girl for a while now, but things have been complicated. We went two years without talking, but we reconnected in October, and it was great. However, around March, things started to feel more like a friendship. I was also helping her financially because she didn’t have a job due to school.

Recently, I suspected she was talking to someone else. A few days before that, she became upset with me for following female friends on Instagram, even though they are just friends and coworkers. On Sunday, we had lunch, and she abruptly got a phone call and told me not to say anything, just to be quiet. She immediately wanted to go home, and I asked her why, ignoring my questions and telling me that I shouldn’t be asking questions. I immediately just suspected she’s talking to another person. I told her that I couldn’t continue our relationship because I still have feelings for her. She seemed okay with breaking things off and didn’t even seem bothered. Today, I found out she has been seeing her neighbors for a few weeks now without mentioning it to me. I feel extremely taken advantage of because during that time, I was paying and supporting most of her financial needs for the last couple of months.