Getting over him

My fwb and I had a falling out 3 days ago and I told him we should quit talking but in reality I said that because I felt so terrible and stressed about potentially losing him that I just wanted it to be over so I wouldn't care so much. But I do care a lot. A lot more than I thought I would. I can't stop thinking about him. I keep wanting to snap him and tell him I miss talking to him. I've looked at his Facebook and instagram pictures and replayed all of our conversations together and all the times we laughed and flirted at work and all the days I'd go to his floor and make an excuse to need something from their supply room when we had it on my floor all along. I miss what we had. How do I get over him? I really would love to continue to speak to him but I am not one to make the first move especially after I brought up not talking.