I heard this rumor that alexi laiho has a girlfriend back in Finland but cheats on her all the with groupies is that true and if it is who is his girlfriend?

Alexi is dating Kristen Mulderig. She's not from Finland, she's American.

They have been together for a while (some years?)

Don't know if he's cheated on her, but he's often around groupies, so who knows.

Janne is married to Tiia Mononen.