Okay. My suggestion is going to be counterintuitive, and you possibly won't like it:
Eight sessions isn't nearly enough. And spread-out sessions probably offer little in the way of assistance.
Why?
Because you intellectualise everything. You want to read, and study, and think your way through this. That won't work. It won't work at all. The reason for this is that you have quite understandably done everything you can to avoid what you're feeling.
And why not? It was fucking heart-breaking, having your heart broken over and over again because your mother just wasn't able to be there for you. Slowly, we learn to shut down, and not to feel - until it becomes so second-nature, that we don't know what feeling is anymore.
So my invitation is for you to go in deeper; and regularly. Go to therapy once a week, indefinitely. One of the main reasons you might resist this is the main reason why you are the way you are: avoidance.
We avoidant types will do anything to avoid intimacy, even while we crave it. But to get too close to someone means pain - and to get too close to our therapist, by turning up regularly and over months, not weeks, means getting closer to the source of our pain, and being in an increasingly intimate situation with someone from whom we cannot hide.
By all means try to think your way out of this. That, though, has only got you this far. Instead, risk the mess and chaos of commitment to your own process. The men you find yourself with will change too. They might still be avoidant at heart, but you might find that they are also, like you, committed to the mess and chaos of their interior lives.
Stop thinking, start feeling. It's going to feel strange, and possibly shit at times. Life, however, will change far more than it is at present.