How do I stop feeling jealous and insecure?

I met this girl in person and we hit it off. For some reasons she had to move away. We text everyday and FaceTime a lot. We a lot of times fall asleep on call. She says she likes me and I told her I like her. We say a lot of flirty things like calling each other cute and stuff. We also talk about things that couples would talk about. For example wanting Polaroid photos to put at back of phone case, wanting to hug, kiss, etc. She cares about the women in my life especially those who have shown interest in me. However, she told me that she made new guy friends, and she told me they were going to hang out and how she likes their style and stuff. I feel like she has been texting me less because she has been talking to the guys. One of them also gifted her a shirt. I don’t know if she is starting to gain interest on the her guy friends or not. I know we are “long distance” and I because of that I worry more. I know me worrying about this much is an issue but what’s going on? And how do I change this jealousy and insecurity?
How do I stop feeling jealous and insecure?
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