I knew it was coming to an end!! :(

I know things don't last forever. The 3 1/2 years I was with my FWB were the best years of my life. I learned so much from him and we had tons of fun with each other. I know it's going to take some time for me to get over this, we have both went thought out a lot. He's been my best friend first before being FWB. He told me we can still be friends, but I don't know how this is going to work. Since he was my Boyfriend for 1 year.. :( have any of you girls been in my place before? Any tips for this?