I lost an amazing friend through bitterness?

When my ex and I broke up he wanted to stay friends, and I really wanted to believe I could handle it so I tried it immediately. It ended terribly with me lashing out on him for no longer knowing if he felt the same for me and me getting very hurt when he talked to another girl. Now I lost the friendship too. My friends tell me not to blame myself because its difficult to be friends with someone youre in love with when they dont feel the same. I just lost an amazing friend and it sucks, what can I do? My emotions have leveled off since everything happened.