If a guy asks if you masterbate and claims he is just curious ...?

[stoptime]

So, I sort of feel like i know how my response will be answered on here, but i must ask or else i'll go mad. So, i've recently started talking to this guy on msn who is a friend of a friend of mine. Except she doesn't know we're talking, because he was on her account when i stumbled across him. We were both bored and i decided to add him on msn. Turns out he knows all about who i am ( we run in the same social circles, we haven't been formally introduced, but i've seen him and know he's a real person) He and I have had some flirty banter as-well as conversation over deeper topics that he supposedly hasn't discussed with anyone else, such as his depression and his nightmares about an accident he was recently in. He also, according to him, has trust issues partly pertaining to his crazy ex girlfriend. So it's a big deal he's telling me this. Especially since the suicide of someone in our social circle the mental health is more closely watched. He usually hounds me with questions, but one day he inquired whether or not i self pleasured and upon my hesitance figured out it was indeed affirmative. He then kept badgering me with other related questions such as when was the first time ect. When i ask if hes horny and if thats why he wants to know he denys it and says its curiousity. Despite the fact i'm hesitantly co operating, i dont fully trust him. He has given me his word he wont tell anyone, but i'm the one with trust issues. I really like him, so i continue to talk to him but all my gut instincts say he is just using me. I am a sophmore and he's a junior if age is relevant.