Awesome advice!! So, what you are confirming to me is that I'm pretty much ready for EHarmony, which is the only way I told myself that I would start dating again. I was tired of the "game", women who lie, and, believe it or not, women who were just interested in sex. (Thank you God for giving me that gift!) As far as the first question, I actually don't believe exes can be friends unless they only dated a couple of times and nothing got serious. But, with this one, it progressed all the way to an engagement. She was the first to contact me about not wanting to go to movies and such alone. But, she stays so terribly busy that its just plain hard to reach her via phone, facebook, text, anything!! As far as the second, you're right and, in the end, I did feel bad. Hence, why I just stopped everything all together. I'm glad I posted this because I hope to get more solid input.
As to your second question, it hasn't been that long. You don't need to call your "just sex" friends to remind yourself how to function as a man anymore. I guess you can call them if you are desperate for sex and don't want to try to meet new people . . . but you've been there/done that and sometimes people's feelings get hurt when we just use them for sex. They may be on board with it too but bed buddies can end badly and if you initiate it, then you would be the bad guy if it goes bad.
So, to me----------- it sounds like you are lonely. You are seeking companionship and would like someone to hang out with and do things with. You also are ready for a sexual relationship again. It just sounds like you are getting ready to want to date again and I'd set yourself up for healthy situations to go about doing that. good luck