Mmmmm...sounds kinda sketchy. I have experienced this before actually. Hell, Ive had guys call me after a month, 6 mos. a year...I never can figure it out. I had a guy (who I met randomly in a bar, gave my number to, and then regretted it the next day and hence never picked up) call me after 4 months. I had met him for only about 15 min in a bar.

I mean- it blows my mind.
I think part of it is just boredom. Part of me also thinks that some men (and women too) have 'little black books' in their cell phone...that way when they find themselves single, looking for some action, whatever, they have girls to call. This one guy who I made the mistake of thinking was 'dateable' wouldnt call me for 2, 3 weeks at a time...and then pop up and want to get together, always calling saying "heyyyyyy!" like we were long-lost pals. Then he would act really confused when I would say "who's this?" b/c his # wasnt in my phone anymore. But apparantly he thought it was normal behavior.
Maybe your guy suddenly found someone else to hit if off with, or an ex-gf came back in the picture...who knows. Now maybe that didnt work out, and hes back.
I mean, to give him the benefit of the doubt, maybe he really is interested again...but I dont know. Flaking out like that months back, and then making up (?) an email that he allegedly sent...and then not replying when you asked him what he was talking about...sounds weird.
I would just sort of write him off- respond when you hear from him if you want just to see what his deal his. But I wouldnt try to get any info out of him (like- "why havent you called me these past months?"). He doesnt sound like he is necessarily boyfriend material b/c guys that want to be your boyfriend don't leave you hanging for months after disappearing.
So, chat, text, whatever, but I dont know...I wouldnt put too much emphasis on him at all. I would write him off of my 'dateable list' unless he has a really good explanation, and my guess is, he wont (if hes avoided all attempts to give you one thus far). Its a shame you seemingly hit it off well and then he got weird, but...its just that. Weird.