Depressed about broken engagement

Depressed about broken engagement
I got engaged to a girl about a year back. It was arranged by my parents and like an obedient son i followed their orders. Naturally i shared this news with my colleagues and threw a party and celebrated big time but the engagement broke off after sometime. Now i had to tell the same colleagues all over again about the reasons for the engagement breaking-off a 100 times and now i am completely fed up with this.
I am very depressed and cant concentrate on anything. My parents dont understand my problem and are looking for other relations for my marriage.
I am even feeling suicidal because i am ashamed in front of my colleagues and not getting any support from parents and friends. Nobody seems to sympathesize with me and is busy doing his own thing.
Please advise.