Why won’t he ask me out when we’ve been texting for a while now and it’s clear we’re attracted to eachother?

First off he’s not a mean guy or anything, just really quiet and doesn’t seem social. He lives in my building. I’ve seen him sitting alone a lot out places and never with a girl. We have a 20 year age difference. Anyway once I dropped all my groceries and he helped me pick them all up. But he just texts me to flirt. In the past he’s told me he’s worried he makes me uncomfortable. I have cleared this up several times so he knows I’m not.

Why won’t he ask me out when we’ve been texting for a while now and it’s clear we’re attracted to eachother?
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