(first; I'm not OP)
>You honestly have no right with getting involved in their relationship.
Yes, he has, if the girl doesn't like her current boyfriend that much.
>And if you do, he has every right to beat the shit out of you.
No, that's physical abuse and is illegal.
and finally
>Just because you two have similar interest, doesn't mean you are meant to be together. (...) Did it ever occur to you that her boyfriend may have the same interst too?
You contradict yourself here..
tl;dr: you're a creep