Gay, Straight or Bi

So I am left with quit a few questions after the end of this last "relationship". It's relationship in quotes because it was lets say nonofficial. One of the major and most unsettling questions is that of his sexuality. In the very beginning of the "relationship" he told me he was bisexual, in my shock I didn't pursue further explanation (I was on probation after some bad behavior of my own). After a weekend of me and my girlfriend M repeating the phrase "I've dated men, but I don't like dick" over and over again in astonishment, I decided to ask him for further explanation. At this point he reneged and said he was just trying to freak me out and see how I react to unexpected things. The evidence I have to his bisexuality are as follows:

• Myspace post from another guy addressed to "Hey Sexy"....but ending in "bro"
  
• a flirtatious calendar appointment to another guy with the subject "I want to be near you.....physically"
  
• he once told a mutual friend that he was planning an elaborate dinner for a guy he had meet and was waiting for the guy to call him
  
• feminine mannerisms

I questioned him several times more during our "relationship" about this subject, each time he vehemently denied any activity or sexual interest in other men. So I am left with the question, is he gay (no), straight (maybe) or bi (most likely).