THE WORST FEELING EVER

I'm not one to post personal stuff on public forums.  I'm thirty years old no kids, good career, and I have my own home and car. Long story short I had a huge crush on a man I worked with for the longest. So when he asked me out the end of July 2016 I was extremely happy. We work at the same company just different departments and schedules. We went out on August 6,  2016 and had a complete blast we were hanging out strong for the end of summer.  We had a discussion on our initial date he said that he was single and that he wants to pursue something with me. He said that we were "exclusive". Hmph so on September 2, 2016  I go to he invites me over his home as usual because he cooked for me when I came over his home after work. That night was the same as usual but at 12 in the am his girlfriend walks in the bedroom and before I could even get my thoughts together this dude is already out of the apartment. I've been extremely hurt and sadden by this whole ordeal because I can't phantom why he could be so sick and put himself and me in danger. To say the least I went clean the hell off. And he tells me that I need to see a psychiatrist because I went off on him and I should just move on because people get hurt all the time. I am really just sooo disgusted by men at this point it's like what the hell is the use. I was honest and had respect for him, and he just dismisses my actions as if he were not the cause and the kicker to the whole situation is this he wanted me to stay. Foh