How do you know if a guy will be faithful in a relationship?

Answer:
You don't. That is the problem. Check out this guy's history to see if he has cheated before, and check his overall personality. If he is a complete idiot and seems completely uninterested in you, don't date him. That's pretty much all I can tell you.
First answer by AmelynnAubrey. Last edit by AmelynnAubrey. Contributor trust: 1 [recommend contributor recommended]. Question popularity: 1 [recommend question].