Vise, I've been thinking about your post for a while now and what to say. I can see the pain and suffering come out in it and its the same or similar as most of us experience right after BD. Back to the basics for you with sleep, exercise, GAL, etc.
Something I did notice is that I think you keep looking for validation from other people. We both know what the hair cutter was, its the same as you trying to find other cute women to talk to. Your emotional needs aren't being met by your W and you're trying to find it elsewhere. This is a very dangerous slope, please watch what you do. With the amount of pain you're in it wont take much attention from an attractive woman for you to fall into the A trap. Just don't go down that road, don't. You should be working on relationship with other men, not women. Stay away. I understand the loneliness, it hurts, but you have to work on loving yourself first. You don't right now, your W and others rejecting you is giving you hit after hit and you are taking it all personal. Stop, there is nothing wrong with you and you don't need another person to show you that.
Its difficult for many people, especially introverts to connect with others. It takes time, don't rush it. Oh and btw, you can GAL and do introverted things. Find something you enjoy and do it. When I have free time I go to the movies alone, I'm(was) extremely introverted. I also share my feelings and connect with other men in a mens group. I highly recommend finding one. Look through your church. There are also Stephen minister's in churches that can just be a person to talk with through the rough times.
I actually went to see the newest hunger games movie, part 2 last week. It was 30 mins into the movie when I realized I never watched part 1, oops! A few others were talking about this in Grlonfrs thread, wonder if they will chastise me now. lol
Your W getting her needs met by the neighbor is about her and not you. Your still early on in this and need to back off with the expecations before they throw you anymore than they have. Zues said it all above.
Being quiet and introverted is something you can work on but I accepted something a few months ago with this. This is going to be the thing that takes the longest for me to change. Years to get to a different place. You can take baby steps to get there, you don't have to go from introvert today to social talkative person tomorrow.
IC is good, but can be expensive. Get in a mens group or some other free resources.
Accept what is, let go of what was, and have faith in what will be