A guy much older than me is showing strong interest. What are ways to make out if he is serious about me or just after a fling?

Anonymous
So this man who is about 25 years older than me (I'm 22) has been hitting on me in a pretty classy way since almost a year. He never went too far and always backed off immediately if I didn't respond positively.
He's been helping me where he can and told me stories about his private life that should be kept secret, meaning he trusts me. He also seems to be noticing all the small things about me because he comments on them, showing that he noticed.
Lately, when we see each other (we are co-workers) he grooms himself. He's even being a little shy, but since I'm not rejecting him, he takes the initiative a lot. I would respond to his advances more openly if I wasn't so confused as to whether I can trust him.
A lot of things happened that made it clear that I can count on him as a friend and he respects me it seems. Yet I'm very cautious.

I think he's nervous about me getting a boyfriend, he's been indirectly asking quite frequently. And he even gets jealous of younger guys around me, gah, cute.

How can I make sure he's not just after my youth etc?
Help please?
Updates:
+1 y
Guys, I appreciate your opinions, but please note that he is 25 years OLDER than me, not 25 himself :D just wanted to point that out to those who misunderstood :)
A guy much older than me is showing strong interest. What are ways to make out if he is serious about me or just after a fling?
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