I Am Confused About My Feelings

i’m in an ldr relationship with someone. we’ve known each other for a really long time, and he’s younger than i am so i’ve always thought of him as a little brother more than anything else. a while back he told me that he’s had feelings for me for a while, which i was completely oblivious to. he told me that it was fine if i didn’t feel the same way. i didn’t at the time and he was fine with that. a couple months later, we were talking and it seemed like overnight he was calling me his and the next morning we were unofficially in a relationship. he never asked me and i didn’t agree. it just happened. i was in a relationship prior to that, and it feels as though i moved on way too fast. it had been a couple months but i wasn’t looking to get into a relationship at all. i do love my current boyfriend so much. we’ve been through so much together. this is the happiest i’ve ever seen him be. i love him but i have so many other things happening in my life right now that i’m not sure i can support him and be his girlfriend when i can barely look after myself. i know how brutal it is when the person you love doesn’t love you equally back. it’s not fair to him i would never entertain anyone else nor would i act single if i did decide to break it to him. i would be his first heartbreak. i love him more than anything but between him and everything else, i have no time for myself. he’s always talking about how he can’t wait to live with me and how happy i make him...i feel like i have no breathing room. if i had to choose, i’d rather feel like this than break his heart. however, i feel like it’s not fair to him. i can’t be the kind of girlfriend he deserves because of everything else. i can’t open up to him because i’m not used to having someone there for me all the time and i’m honestly scared. if i did end things, would he be the same? would he still love me? would he hate me? maybe i’m just overwhelmed with stuff but i don’t know. i feel like a horrible awful disgusting person.