I need advice on what to do with this girl

We met each other in September because we were supposed to go out as a group but the plan failed and she invited me to hang out alone for a bit. When we were together alone it felt awesome.It seemed like we both liked each other and in the same night she started to text me on instagram. In the next several weeks we spend texting each other every night for 4-5 hours and she usually asked me out to hang out just the two of us. I started developing feelings for her but I think she noticed since she told me once out of the blue that she likes me as a person but doesn’t want to be in a relationship now but we should still hang out. It stinged me but since I liked that girl I continued to meet her. Eventually when we went out she started being more physically intimate with me but insisted on us keeping it platonic which started perplexing me. We had the chemistry and also we seemed to like each other but guess she wanted us to be platonic despite her being very physically close to me. She started laying her head on my chest and shoulder and putting her legs over mine. In January she said that she felt like we were platonic soulmates. The problem is that I need to study very hard for some months and I can’t give her attention without we being exclusive since I feel like eventually she might decide to leave me and there is nothing I can do. But also she gives me hints and likes for us to be together but not in a relationship. What should I do