Ask yourself the reason why you're splitting. If it's because your bored and want to move on, of course you'll cope, but if he's been doing the dirty, you're better of without him. If you think you still love him, why not sit down and talk? Change is probably the hardest thing to get used to - but like everything, from where you live to what job you do, you soon adjust. Hope it works out.
You don't! But you are obviously having doubts about him anyway. Don't just hang on to a relationship if you don't think think you can cope alone - that's not fair on either of you. Besides, you were coping admirably before you met him, weren't you?