Is it time to let go?

My ex and I have been broken up since September and have been talking here and there. I was the one that reached out to him after two months of not talking and made a lot of effort in trying to figure out why we didn’t work out and if there is a possibility of us ever getting back together. We still talk over the phone at times, talk about our memories, give each other advice etc. Although it wasn’t until Sunday we argued after a while of not doing so, the next day we talked on the phone and he basically told me that he doesn’t want to make me wait or give false hope. He says he knows I wouldnt do him wrong but he’s seen it/been through it and says that he’ll always love me and that I’m his best friend and also our relationship isnt over... as of now i am very lost and have slowly started to detach myself because it’s hurting me to see that he doesn’t reciprocate feelings towards me. I gave my all for this guy and really love him but I just want to know how to let go.... I can only do so much but I’ve learned that i can’t force love and i can’t force a connection either please help..