M4F long term relationship scene involving cheating (potential breeding & cucking)

Hi! I have been here for a month or so now, the community is super welcoming and friendly. Thoughts its about time I jumped on the RP hype and listed an idea. I will admit, I am a decent writer, but not super experienced when it comes to RP. So, if you are looking for an insanely detailed, experienced writer, I might not be the person for you. But, I am enthusiastic and willing to try! 

Now, ideally, I am after a scene that's sort of similar to my real life situation (have written about it on other forums). Me and you (your character) are in a long term relationship. We are each others first sexual partners and serious relationship. However, something has rocked the relationship, and you have cheated on me for the first time! Oh dear. 

This is a very vague, and open scene. The RP (ideally) starts with you confessing your infidelity towards me. This can go NUMEROUS ways. Something low key, or outright fucked up. I don't mind either. I'll give examples - you confess you made out with another guy on a night out with some friends. You confess you fucked someone else on a night out and they may have impregnated you. 

These are just two examples, not what happened! We can use them, discuss something, or you can also bring your own to the table. The idea of this RP, is what happens next? Do you genuinely regret the infidelity? Does it push you to want more? Will you cheat on? Will you cuck me? It can go tons of different ways, and I thought it would be a fun, easy, open scene for me to dive into the realm of RP. 

If nothing makes sense, please do say/ask. Or, like I said, I am a bit of a newbie. Welcome to any changes or suggestions that would make my idea more fun! Interesting? Comment, or send me an EcchiText.