Should I say hi to him or continue ignoring him?

guy friend flirted with me about us hooking up. the thing is he has a gf overseas and is engaged to her and knew I developed a deep crush on him. We exchanged a few words about getting together like where we do it, and if we would use protection, etc. I was really falln 4 him and he told me that it was best that i focus on someone else. anyway a few days later, I texted him to wish him Happy New Year's and he didn't text back and i got upset and called him a dog. I then wrote him a note apologizing to him and suggested that we stop texting each other about . Weeks later, he looked at me like he was angry but still said hi. I emailed him asking him if he was still upset and that it might be best that we treat each other as coworkers. he replied back and told me that i was too weird and that he was just jokin and that i should get some friends and a bf. Now I don't talk to him or even look his way, since I have mixed emotions about thi