What the hell is happening and what should I do about it?

I love this girl and at first we had late night conversations and stuffs. But later she told me about a guy who she loved but they weren't in a relationship. They don't even talk anymore. I developed some feelings for this girl as I felt a connection between us. But when that guy text her she ignores my text and text him and she'll only tell to me after a week. One day she had a coffee with him after college. He is the one asked her. After this coffee she didn't even text me and told me this after a week. This happens everytime. Like 5 to 10 times. she wasn't even there when I needed her the most. But I was there for her. Yesterday night too happened the same. Is this toxic? What should I do

What the hell is happening and what should I do about it?
Post Opinion