You only have to look at one of the online dating sites, to see that there are thousands of other people in exactly the same situation as you. So as a single parent, take a look at Dating for Single Parents UK, and you'll see that you're not alone!
Sometimes it takes a while to get over a breakup, but don't feel too sorry for yourself, and let life pass you by. It's your life, so live it! Get out and meet some new people - it's amazing how good it will make you feel. Not all dates will be fantastic, but that's life. Never be afraid to experience it!
Be assured, there is someone right just waiting for you out there.