How do you know a guy is serious about you?

Anonymous
I'm really bad at reading people's intentions, especially men's.

The guy I'm talking about is a friend of mine, he's really funny, I'm never bored with him, he doesn't seem to mind that I'm quite different from the others (no parties, nothing illegial, an outcast these days).

I don't want to assume anything but lately I noticed that the atmosphere between us has changed, he always complimented me but lately he's been doing so much more, we're also spending more time together than before, we actually go out of our comfort zones for each other.

So I was wondering, could any of this be a sign of him being interested in more?

I've always been a relationship-type of gal only, he's more of a skirt chaser.
We know each other for a year or so.
I must add that he's 10 years older. I'm 23, he's 33. --- could the age difference be a problem?
How do you know a guy is serious about you?
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