i need advice

i’ve been dating a girl for 2+ years and our relationship was perfect. when i started college our relationship started to go downhill. i’m not sure if it’s because we go to the same college or what but she has been distant and doesn’t really appreciate my time. i tried talking to her about it but it always ended in me crying myself to sleep while she slept right next to me. i’m tired of feeling like a burden to her while all i want is for her to love me. she started hanging out with her friends a lot which upset me because i never get to see the happy side of her anymore. i do get jealous when she’s with them because i want her to want to be around me like she wants to be around them. we’re currently on a break right now so she can “stop hurting me and work on herself” but this whole time she’s just been doing things that she knows would upset me. it’s hard not texting her or seeing her, and honestly i’m not really sure what to do anymore. i’m so busy and this happening makes me want to lay in bed all day. i just want to text her all day and see her but my messages go unread. last night i asked her to come up to my room when she was done hanging out with her friends so we could talk but she told me she didn’t want to see anyone and kept saying no. i feel like i’m holding onto her more and she’s pushing me away. i need advice guys because i feel so lost and don’t know what to do. i don’t understand how you can do this to someone you love. we’re still dating, but it feels like she’s slowly letting me go. please give me the best advice, i really need someone during this time. i need to know how to not want to text/ see her everyday or feel so lost without her.