Can sum1 help me?

Right I might end up deleting this later on depending on if I get the answers I’m looking for. But I’ve been talking to this girl for a while and we are together. We used to talk all the time but now she hardly speaks to me. I send her a message 20 minutes later she’s active but ain’t replying. I’ve told her about this situation plenty of times and she’s doing nothing to fix it? Am I just being overly skeptical about her talking to other people or do I have a right to feel the way I’m feeling right now?