What does it mean when a guy says "What are you doing tonight?"

Anonymous
Me and this guy were talking and he asked "What are you doing?" I said "Nothing, I am just at home" So we talked for about 25 min and then he said "What are you doing tonight?" I said "Well, today's Monday so probably nothing haha" He said "I'm not doing anything either, but I'm gonna take a nap, I'll see you later" Did he want me to ask him out? every time he asked me out before I did reject him cause I was unsure about him, but since we are close as friends I do want to give him a chance. I don't want to make a fool out of myself at the same time, so should I text or call him later and see what he is doing? Do you think he was fishing for me to invite him out somewhere?
What does it mean when a guy says "What are you doing tonight?"
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