Can I just beat up my boyfriend's stalker ?

Yriuqni
There is this girl who has been stalking my boyfriend since before we got together .. (together from 2 years) .. she keeps messaging him and keep stopping him in the street and talk random stuff.. he was clear with her that he needs her to go to hell ,but nothing .. she is still there! .. Yesterday we were at a party and my boyfriend got a message from an unknown number ( its her, but he doesn't have her number) to go down because there's a surprize for him.. of course her ignored it ... later that day we went down and there she was .. she came saluted me with a kiss ( she never says even hi to me , and we see each other every day in college ) .. I gave her a sh*tty look and left them both .. I was so angry with her, she is so annoying .. and I swear if I were to stay one more minute I would've grabbed her by the hair and mop the whole stage.. My boyfriend finished talking with her really quick and came to me apologizing and all that .. but it's his mistake too you know .. he shouldn't have stayed there and talked to her.. it's just that he doesn't like being rude to girls .. and it's fine , but not with her.. it's NOT okay to treat certain people nicely ... I know it's silly and all that, but I hate how these girls have no limits, or respect! .. Should I just go to her and tell her to freaking back off .. I already told my boyfriend to stop being nice to her and he was okay with it .. but still I wanna slap her so bad :S

Do you guys ever encountered such situation ?
Can I just beat up my boyfriend's stalker ?
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