I just needed somewhere to vent

So I met this guy when I went on a night out with my girls he seemed like a genuine nice lad and we had quite a lot in common , so we were speaking for a month texting , phone calls e.c.t and then the day finally came he'd asked me on a date ! I was so happy as I'd never been asked/ been on a date before so I went everything went great I thought we went back to his after a few drinks and one thing lead to another blah blah blah he took me home later that night and was texting me all night saying how much he enjoyed the day , I then woke up the next morning to find out he has a girlfriend over social media I was a little bit hurt but I thought you know what I'll just ask about it first before I presume things so I did only for him to block me off any contact I could of had with him and now I just don't know where I stand in life I get it was nothing serious but still I was lead on and I just feel like no one close to me understands.