help!!

Miah • so happy to have him:)
I am horrible at relationships!! And idk what to do with me😩 so I get a boyfriend and I start out liking him a lot and then we make out a few times and a week later I feel totally different about him😔 I feel like a total whore when this happens😑 I am a freshman in high school and there are so many guys that like me rn there are maybe 7 guys that like me. I have a boyfriend and he really likes me and there is another guy that I liked before my bf but I didn't tell anyone because I thought that he wouldn't like me back. But I usually go to him when I am upset because he is one of my best friends. Some girl made me and my boyfriend break up for like 2 hours and I called my best friend and he was saying everything is going to be okay and stuff and then he had to get off the phone so he started texting me. My boyfriend came over to fix everything and when me and him were laying down and watching tv. My best friend texts me and tells me he likes me a lot!!! And this is the guy that I liked before I got my boyfriend. And I didn't tell anyone because I didn't think he would like me back. The thing that I need help with is that I need to understand why I loose feelings for a guy so fast😩 bc I am sure if I start dating that guy that likes me( my best friend) then I will loose feelings for him too. It literally happens to me every single time I get a boyfriend! I loose feelings after a week😭😭 idk what to do😭😭😭