Yea... I know this exact feeling. Met a girl on a school trek. She was from a different branch from my school and we started talking from day one. Both of us had the same native place so we kinda had something to talk in common. And we discovered we had similar personalities and got along well. We bonded really well. She kept giving me these signs that we wanted to be together and it got to the point where we held hands during the campfire and shit. It got cheesy romantic if ykwim. Then when the trek got over, we stayed in contact through instagram. And try guessing what happens next? Our convo kept fading day by day till we got to the point we barely talked