Guys, Passive or disinterested?

I came across this guy's profile on a dating website in summers and the words there seemed so honest and soulful, I ended up writing him. He described himself as an immensely passive guy. Its been four months since we have been sending each other a long chain of conversatio on WA and he writes back like twice or once a week. He bares himself mentally quite a lot, and our conversations have an emotional connotation. I dont want to jump into a relationship with him, I'm happy with the slow buil up, if at all he is into me. The thing is, he doesn't seem too enthusiastic about meeting. In the sense that he never initiated it. We met recenty and had a great time but it was all initiated by me. He looked happy throughout the time we were together though. He told me it was immensely enjoyable but then disappeared for three days. What are the signs that a guy (who is probably passive) is into you? I could ask him directly but I think I have already made him pretty aware that I really like him. I couldn't stop blushing when I was with him and I am pretty considerate with him over all. Help me understand him?
Guys, Passive or disinterested?
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