Your gut tells you how you know things are, concious part of mind tells you how you would like it to be. There's no concern if these two meet.
That's why you tell yourself things like, 'no she would never cheat on me after all we've been together. She would never be that disrespectful', 'I'm just overreacting and being insecure, of course she loves me', 'no I don't have a problem with alcohol, this is just temporary', 'she's probably just busy and will call me a in an hour', 'she's a great and pretty girl, I have no reason to break up with her. I'll give it a bit time and I surely will fall into her'...