So I was walking down to the train station one day, on my way home, and this bloke stops me and tries to flirt with me. Tells me I should smile, meh. I'm not too good with those situations, never know how to handle them. Any way he asks me for my number so I told him I already have a bf (which I do). He said he justs wants to be friends (do guys actually mean this when they say that or do they just like a challenge?

I really want to know this so would appreciate some answers). So I gave him a fake number and then said I'm gunna be late for my train, I ran off before he could call me (so I can receive his number) and realise it's a fake number. (The reason I'm reluctant to give my number to strangers is due to bad experiences in the past).
You'd think that'd be a hint that I don't wanna talk to you but I guess not. I met him again a few days later and he asks for my number again. Couldn't get out of it this time, I'm too nice (aka lack the balls) to say 'fuck off' so I had to give it to him this time. When he called me, it turned out that I'd met this guy before cause I already had his number saved. I cant remember who he was exactly, but I do remember that he either annoyed me or bored me to death the last time he was texting me. Oh the joy! Now I have to put up with this again.
He texted me later that night with the message- "You ok". What a conversation starter! You can tell he's an expert! I decided not to bother replying to him. I really cant be asked dealing with this moron again. You'd think that'd reinforce the message that I don't want to talk to him but did it fuck. I've had several messages from him since. They're either some weird chain message asking me to smile or how I am, or he's just asking me how I am with his amazing conversation starting skills.
8 messages on and I hadn't heard anything for 2-3 days. Thought he'd given up, but yesterday on my way to see my bf I bumped into him again. He tried to greet me but I told him I'm off to see someone and walked off as fast as I could. You really would think that he'd start getting the bloody hint by now! But noooo!!! I've had two messages since yesterday!!! Fucking hell! Give up already! I'm half tempted to text back a 'fuck off' but I'm too scared I'll bump into him again. I get the feeling that he'd probably still try and talk to me. Why the hell is he so obessed?!!!