What to do! She doesn't regard you as the most important person. This is a problem. First ask her what this "most important" is defined from. If it is an emotional definition, you will be miserable. If not, then you are jealous, which means you care about her and she is very important to you. Explain it to her. Explain it more. If you are finally ignored, it means that you are miserable again, and the explanation is finally ignored.