I cant take this anymore.

My Ex boyfriend has a new girlfriend. However he still tells me he loves me and that we are best friends forever. I almost feel as though he is leading me on. We are very close to this day but every time I talk to him I feel almost rejected and I get upset after a couple of conversations with him. I asked him several times if he had any intentions of being with me and his reply is "idk what the future will hold, i will always love you" -- Im sick of crying about him, it's been tearing me apart for 5 months now. And when I explain it to him all he says is "i dont understand, we're supposed to be best friends" What should I do?