A man twice my age is pursuing me. How do I know if he wants a serious relationship?

Anonymous
There is this man, a co-worker, who is more than twice my age. He's been showing a lot of obvious and direct signs that he's interested in me but because some were childish, erotic and playful, yet some were kind of serious, I'm not sure how serious he is about me.
He's touched me in subtle and sensual ways and behaved like a real kid, getting jealous and impatient. Then again he's been very calm, patient and heard me out when I had trouble. He told me things about his life and tried to make more of a personal connection between us happen.
And there are times when we don't see each other for a few weeks and then we don't have contact at all, but when we meet again, it's the same all over. Kind of hot and cold at times. And he promises to do some things for me on his own accord, but forgets about it most of the time. I know he's busy but that doesn't justify breaking promises.

How do I interpret all of this? How do I find out? This has been going on for half a year.
A man twice my age is pursuing me. How do I know if he wants a serious relationship?
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