It's complicated... No, he's complicated.

I've been riding this wave of insecurity with Mr. Bull for over a year now. Abbreviated version: we met at the university, he was my t.a. and basically made the class awful. He would call on me 12-14 times a day, stare me down in that typical bull fashion, it was just very uncomfortable. For the past 7 months since the end of the class, he's been regularly sending me messages every few weeks. The messages are the only consistent thing about him, actually. Without fail, whether I respond or not, or whether he responds to what I say, he's been continuously reaching out.
Last month I got up the guts and asked him to get coffee with me. He was very excited about it and we spent two hours talking. Actually, he did most of the talking, telling me his dreams, aspirations, throwing out names and job accomplishments to impress. Being a bull, I didn't hear from him until 9 days later and he made some stupid comment and then didn't respond to what I said. I then heard from him a week later. The week after I heard from him twice. Now it's been almost two weeks and I haven't heard anything.
He can't seriously still be insecure about how I feel can he? I don't think he's cruelly playing with my feelings, but good grief I'm sick of this. Either he wants to be my man or he doesn't. I'm trying to be patient, but how much longer do I wait?

No it's not complicated. He's done chasing you because you are responding. You can't respond too much or it will scare him.