I have a creep in my friendship group who makes me really uncomfortable- what do I do?

[book_babe]

*I know it's a bit long but I would really appreciate any useful advice you can give me.

I talked to him about his behavior but it's had no effect. I'm really scared of this guy
He came up to me and asked me if we're ok; I tried to make him understand that if he wants us to be ok he'll have to change his behavior because he makes me really uncomfortable.

When he asked me what he had done to make me feel like this and I told him: he put his hand up my dress and when I got up to leave he grabbed my arm to stop me when he was drunk, he followed me around and stared at me for 3 hours when we both happened to attend a mutual friend's costume party (I didn't tell him this but when he was staring at me I felt like he was picturing me naked and I was in a long white dress that fully covered my legs, showed little cleavage and wasn't see through- not skanky at all) along with a long purple cloak.

He said that his mind was somewhere else and he didn't mean to stare at me. (If he had only done it once or twice I'd have believed him- but 3 hrs? that's absolute Bull****!)

When I confronted him about his drunken advance towards me he said:
"When I'm drunk and my body takes over I'm not responsible for what I do."

To this I responded that I would kick his ass if he touched me inappropriately again, he said: "You'll just end up hurting yourself if you try because I'll defend myself. "

Then I really tried to make him understand the gravity of the situation by telling him that when I was younger something horrible happened to me with a guy and ever since then I've been pretty sensitive to certain things like guys making sexual jokes or touching me at all.

He apologized for his behavior and went on to explain that I wasn't his type (even though I found out from his close friend that I am exactly his type- young, reserved, brunette, voluptuous, shorter than him- he's 6.3ft tall and is built solidly like a tree) that he's not interested in me in that way at all.

I asked him why his attitude towards me changed (he used to be really nice and not creepy at all) and he couldn't explain why and went on about how he puts on different masks (metaphorically) and different people see various sides of him. (I feel like he was basically saying to me that if I told my mutual friends about what a creep he was being towards me none of them would believe me because he's got them all fooled).

After our serious conversation when I hugged him to say goodbye he thrusted against me and said "Oops!" with a huge grin on his face.

I've already talked to 4 of our mutual female friends and none of them are taking my concerns about the creep seriously- they all say stuff like: "That's just how he is." "He was just joking." "He didn't mean anything by it." "Don't be so paranoid." "He's a nice guy." "That's just how boys are."(he's almost 30 for FS!)

I'm really frustrated- I deleted him off Facebook and lately I've been avoiding going to a few social gatherings when he's invited.
When I've had to go, I ignore him (aka try not to look or talk to him) and he's there he just stares at me the whole time like he's waiting for the opportunity to get me alone and intimidate/harrass me some more.

I've never been this scared of someone before- am I justified in my feelings?
Can anyone offer me any advice for this situation?