Broken Hearted?

I was not too long ago dating someone who I met in Aug and we hit it off wonderfully for well over 2 months, talking everyday and seeing each other generally 2 to 3 times a week.. however due to work constraints that lessened over time, but I was never one to complain, always patient with them regarding that and took what I could get.. however during the beginning of this month I went on a trip for a week (work) and came back to a distant person who later just dissappeared... no calls and doesn't answer any of mine, no contact, nothing... This has really torn me up as I have no clue what happened - I really hate this person for doing things in a cowardly way and wish I could at least get some kind of closure or explaination, but I don't think that will ever happen.... I need some advice on what to do..