HELP!! Seems I've befriended a seriously disturbed individual..?

A few weeks ago I received a Facebook friend request from an old schoolmate, didn't know him too well even in school, but hey it's been 11 years so what the hay..confirmed. We talk a few days though texts about our lives since high school and his is a story chalked FULL of drama & heartache from all angles, naturally I feel sympathy for the guy and when he asks to meet my family & get together in person I said sure. Dispite living over an hour away, he began coming by every single day, my husband expressed concern but I said ah, he just needs someone to talk to.. Talking is something he does allll the time, thing is we noticed he tends to tell the same stories but with different endings each time. One thing I cannot stand is a liar, so I tested him one day, caught him red handed in a lie, not only did he refuse to admit it, but even went to so far as to forward me fake emails & "swear on [his] son's life" that he was telling the truth.I began ignoring him, so he finally fessed up after 2 days, but during this time he was talking to other mutual friends making me out to be the bad guy. I confronted him about all this & he says sorry & seems to think that erases everything. He has been obsessively texting me ever since and to top it off, he now proclaims that my kids & I are "his world", he's always had a crush on me and was hoping I'd leave my hubby... I have gone back to ignoring him but he doesn't seem to get the hint. I don't want a friend who I obviously can't trust & never even gave him a reason to think I would be anything more than friends with him! He called 5 times today which I also ignored, so he left voicemails, rather than speaking into the phone he is talking to someone else in person saying "I love her, what else can I do but say sorry, she's ignoring my damn calls, etc, etc".Nice touch.. I'm trying not to be mean, but jeez.. I am now afraid he's going to try feeding my husband a bunch of crap about his little fantasy if I tell him to go away, or even worse... how do I handle this guy??