well... this is a difficult question to answer. it is definitely true that dating is a HUGE distraction when you are trying to lose weight. not only in itself, but a lot of dating activities involve food and eating out and it's easy to go overboard with the calories.
to someone who has trouble focusing on dieting without outward distractions, i would say maybe dating is not a good idea.
on the other hand, i am a huge romantic, so i would say "why deprive yourself of love?" being in love is wonderful, and i would wish it on everyone. i for one know that whenever i am spending time with my bf, it puts a cork on my bingeing tendencies because i'm so happy to be with him i don't even think about food.
but yeah, basically, you have to decide which do you feel is most important to you. the prospect of a new bf, or the prospect of a new body. and then, if you think you can't manage both, pick the one that's most important to you.