I don't know how to feel

I and this person had been friends for some time already. When we first met, she is very insecure and always like to put distance between people but I managed to go up and talk to her and we became friends. We both were new students and we were both each other first friends in school ♡✧( •⌄• ). We mostly spend time together in libraries, field trips, etc together and I really like her company. She's really hostile sometimes because she's shy and insecure with a lot of people, but that didn't stop me from becoming friends with her. As the years pass she left my school but we still kept in touch. We played games together and chat almost every day. And that's where that situation came... I realized I had slowly become more excited whenever she text or play games with me. Whenever she text me suddenly, I will be surprised and try not to reply immediately (because I will look somewhat desperate (⊙ヮ⊙)). Hmm... I also got a bit jealous back then when a few people around her sometimes. I just don't know this really funny feeling... The feeling is like when the dog happily jumps around the owner that just came home. I seriously don't know if this is a 'really good friend' feeling or a 'I fucking love you' kind of feeling. I never like girls before so I don't know how does it feel like. It's been almost a year that I have this feeling. What should I do o(>< )o?