Scorpio man - is he interested?

I've been talking to this scorpio man for the last 10 days. Am a sagittarian. Right from the moment we started speaking with each other we connected well. Have so much in common;our outlook on various things such as relationships, frends, music, movies,etc are identical. Even though am a sagi it takes a lot of effort for me to get along casually with a guy. However with him within minutes of our conversation I felt at complete ease and comfortable. We chatted long hours(text msgng)and spoke about everything under the sun. Im in my late twenties, single, independent and not committed. Usually am skeptic about guys and avoid getting close to 'em. However the last few days have been different and i feel i might have met the right person. Of course its still too early in a relatioship. But I would like this to turn out to be that special thing and a longterm one. The issue is in the last few days his frequency of messaging me has come down. Like, he used to mesg me from the time he woke up till the time he slept. However now he msgs me when he finds some leisure or takin a break. Also, he doesn't yet want his frends to know abt our chatting episodes. We do have few common frends and he wants the same with them too. coz he uses a nickname for me, they all know hes chatting with somebody but not aware its me. I know that he is very close to his frends and anything important he discusses it with them. So am kinda worried why does he want this to remain a secret. He has also shared with me his past relationships, girlfrends and his expectations about his future partner.He knows that i skeptic about marriage and committments. all the same i dont wanna build castles in the air and waste my time.How do i find out if he also feels the same way? or if he's just that not into me? is there a chance that this could turn out to be a potential relationship? Or he just wants to have fling and thats why he wants this to remain a secret? Please advice.