A distraught Nigerian man is in pains and confusion after discovering that his girlfriend might be having an affair with his best friend. 

The man while sharing his harrowing story, revealed that he found a credit alert of N300K on his girlfriend's phone and to his utmost shock, it was from his best friend. Prior to the day he found out, he has been noticing her attitudinal change and also the rate at which she kept late nights but he wasn't sure of anything. 

According to the distraught young man, he is confused and doesn't know the next step to take. What would you advice him do?