Few things are as devastating as a messy break-up. Your self-image has been ground into the dust, you feel ugly and unwanted and you're sure people are talking about you behind your back. Or even worse, they feel sorry for you.
Life is not over. It may feel like it is over, but there's more to life than the partner you've just lost. You cannot base your entire sense of self-esteem on the reaction you elicited from this one person. It's a bit like never applying for another job if you don't get the first one for which you applied. There is life after a relationship has ended. Just keep doing the right things and you will feel better after a while.