When a guy says 'I love you', how can you tell if he means it?

kaylaaxbabiee
says 'I love you', how can you tell if he means it?

Backtracking a lil' bit; I have a bad history with guys ( big surprise here, I know) & being lead on a bit. I've described myself as an eternal pessimist on multiple occasions.

Now, I have this really great guy who I feel like myself around & am happy with. . . until the other day, when he said that he thinks he loves me.

Is it so wrong for me to be cautious? I just want to know what some of the signs are that a guy has these feelings for you, besides the obvious confession.

So what is it? How do guys say those three words without saying anything? :]
When a guy says 'I love you', how can you tell if he means it?
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