My (30M) gf (28F) said that she?s capable of cheating on me.

tl;dr: my gf says if a fight is big enough and she decides to go out afterwards and finds someone who is all the things she finds me lacking, she could see herself ****ing them.
Been with my gf near 2 years now. It?s been a lot of ups and downs. I know I love her, and in her own way, she loves me. But things like this make me question it. The broad strokes are that we?re probably not that compatible. She seeks logic, mentorship, and intellectual stimulation. I seek compassion, empathy, and emotional support. I?m smart but nearly on her level and I haven?t experienced enough to teach her new things. She is devoid of empathy and doesn?t get attached.
She?s not perfect, but what I get from her, I get from nobody else. She makes me a better person and I care so much for her. What she gets from me she can get from a lot of people. It?s not special or unique.
Last night, we were talking about some other people and the concept of cheating. These people were trying to convince me that cheating can be a mistake. I said it?s never a mistake. Cheating is a series of choices. Nobody just stumbles and falls and winds up in bed with someone. You make a choice to talk to someone; flirt with them; let them touch you; connect deeper; go home together; get out of the car together; go inside together; continue the conversation; strip; kiss; and get intimate. That?s too many choices to be a mistake imo.
So these people were adamant and then me and my gf were guessing which one cheating for them to feel that way. She chose the girl because she ?gets her.? I asked what she meant, and she was like well I?m capable of doing that. She said ?there?s a lot you?re lacking that I miss from the tons of people I?ve dated (I knew this already). If we ever got into a really big fight, I could go out and talk to some people and if there?s someone that has all those traits I?ve been missing, and they?re hot and I?m angry enough, yeah I could cheat on you. Of course, then I?d come home and tell you I cheated and that this over so in my head it?s not cheating because I?m making the active choice to end the relationship via cheating. At that point it?s more I?m just breaking up with you before telling you.?
Idk, I could never disrespect someone like that. It?s not even telling me she would cheat on me. She?s just saying there?s circumstances where it a possibility, however unlikely that might be. And it?s bugging me because I could never sleep with someone without ending things first. I don?t care if she ****s someone 2 minutes after breaking up. At least have the decency to break up first. Is this not the reddest of flags? Or is it just a difference in values?


Source.