In Love?

[mishsa]

How do u know when a guy is in love with you, and is not just saying it!

[tikteka57]

The only one that will know is you! Look for things he does that are sweet and loving.

[Matador]

Usually you can feel it, take note at the small things, the way he look at you, the way he talks to you, not what but the how. Is hard to say, but those small things say a lot.

[EvilEvilKitten]

By his actions, of course. If he's there with you, if he demands respect from you, if he returns that respect to you, if he exudes joy and lights up when you come into the room, if he positively GLOWS when you're with him - all of that. Actions are where it is at.

[Laika]

Look for signs: body language, looking at you in a soft way for a long time for no reason, usage of other similar "around-going" (how I call it) words, initiation of meetings (and not just sex or just going out), wanting to be with you.
He may be not sure what he feels himself, so don't ask. If he really looks like he is in love, then he probably is - but only you can say that.