Maroon 5 - Makes Me Wonder Lyrics Meaning

He questions whether or not he ever loved this girl. He doesn't think it'll even make a difference to try. Yet at the same time he still wants her sexually. He wants her to give him a reason to stay with her but she doesn't have the time to spend on him. He knows he can eventually get over the pain which is something he's done in the past. It ends with him telling her goodbye.