I've never been able to continuously date multiple people at the same time. Sure, I've gone on a string of first dates in the same week, but never has anything expanded from the initial meeting to dating many people at once. So what do you do if the person you're dating is seeing other people while you're very much not? It's less tricky than you think, but you will want to consider how you approach this, for sure. You could very well be pretty unaffected by them dating other people, but it may eat at you the more it goes on and the more attached you get. Everyone is different.