Spending Time Together
Consider how much time he wants to spend with you. According to dating coach Evan Marc Katz, the only surefire sign that a guy is falling in love with you is that he wants to spend as much time with you as possible.
Sex vs. Love
Don't mistake sex for love. Unfortunately, some guys are really good at romancing women into their beds. Make sure you spend time doing other things beside having sex. If he wants to spend quality time getting to know you, he might be falling for you. If he just wants to spend quality time between the sheets, it might not be love.
Listen to the way he talks about himself and about your relationship. If he makes casual comments about your future together, he may see you as a potential life partner. If he shares intimate details about himself, he might be feeling very close to you. If he doesn't call you often or only texts you, it's probably not love, according to Katz.