How can you tell if a guy really loves you?

you can only be sure as the time passes by and you get to know him more and explore more of him! he may try to impress you at times by not showing 'the real him' but that doesn't mean he's cheating on you!everybody does that to some extent a bit ....so have patience and wait! if he constantly keeps caring for you...and looking to every minute things in your life and taking keen interest in you and even doesnt mind discussing his personal problems with you and giving you sane advices on your problems .....he's giving you direct signals...you need to be alarmed! sometimes the gut feeling says and you can sense his love for you! moreover the actions speak greater than words ....so if he constantly keeps saying you those magic words..that doesnt mean he really loves you!you should see that love in his actions!and also if a guy makes an eye contact while saying those words ....he then most of the times mean it! some people show their love by trivial quarrels so if you feel he fights with you on some matters ..that means he feels he has right over you!