If you've met him online, it can be more challenging. Don't think that bonding by having sex will keep him interested. It's the women who feel sad and disappointed when he doesn't call the next day. This is completely different than telling him driving directions, which will drive him away. If a daily phone call is important to you and if you like flirty text messages in between conversations, let him know. If the serial dater realizes that he wants to ride off into the sunset together with you, and only you, you'll need to feel secure that you are number one, not one of many.