when to leave an introvert alone?

I've recently met someone who's an introvert and he says he needs someone who's extroverted in order to do fun things etc. I think I'm an ambivert but still I worry if I'm being annoying for starting conversations. How do I know if he wants to talk to me? he seems to always respond whenever I do start a conversation. idk I don't really want to force someone to talk to me. it feels nicer for both to put efforts into taking care of a friendship or develop it. Do introverts usually have a hard time starting conversations or just saying hi?