How to get over betrayal

A good friend of mine and business partner. Who I used to work with? We did projects. Then he just used me and betrayed me. Feel that I couldn't do it without him and I started to build a dependency on hit really has hurt me.

But I have learnt that in the end of the day we have to do things alone.

He acted like i meant nothing to him and got rid of me once i wanted to leave