i need help /adv/

basically i was talking to a girl online, and i was getting pretty close to her. i then realized i loved her personality more than anyone else ive ever met and i was messaging her every single day as soon as i woke up until i slept. i ended up meeting her IRL and for some reason, at the time i no longer wanted to persue the relationship... i ended up distancing myself from her and then she ended up getting a boyfriend. i feel extremely upset by this so i unadded her from everything. i miss her a lot and i want to message her again, but i'm having trouble moving on. what should i do?