FlatLand Flyer, I feel you bro. My GF was the initiator when we first hooked up and when she left me, I felt so lost. I started dating random girls but that never went anywhere because I didn't know wtf I was doing. Then, a few months down the road, I discovered the world of pickup. I know the community here has a negative view of pickup, but it helped me IMMENSELY both with women and my general confidence.
All the best
edit: Like you, this ex of mine was my first everything. We were together for almost 2 years.
edit: i thought punkmusicfan was the OP for some reason. fail for me