My (24F)gf wants to travel and go meet new friend (24M)

So i (25M)and my gf(24F),we dated for 1year ,in the last 2 month she meet this guy online ,we play video games ,and i have meet this guy ,my gut feeling was worning me about this guy its not about him been a guy ,we got alot of common guy friends but this guy i dont like or trust, and i live in spain she lives in germany,now all of sudden she wants to go meet this guy and that was like soo surprising to me ,now i do trust her but at the same i dont know i just got bad feeling about this whole thing ,she asking for my permission to go i said i dont like it and at the end of the day am not gone control her life ,but my gut feeling is just telling me this is really bad idea,should i just trust her and say okay?