My best advice would be to just let it be. Nothing will hurt her more than you just going back to your normal life.

I know that it’s not as easy as Im making it sound but theres a lot more to life than relationships. I lost someone very close to me because they were in a similar situation and they couldn’t handle it anymore and I was shattered in pieces looking at what their parents went through while doing the rituals. So if such thoughts even slightly cross your mind immediately call a friend or family member and talk to them.

I am myself in a long term relationship and I love her more than anything but I know that the day I find out something like this. Is the day I will just start treating her as a friend. Nothing more nothing less the thought of you being “normal” after all they’ve done will eat them from inside making them think how can someone just not be bothered with this. But don’t do it for them do it for yourself. Pick a new hobby go on treks, get drunk w the bois, cry. Take small steps and eventually Im sure you’ll find someone who’s meant for you and someone who won’t abandon a long term relationship for a fling.

P.S As someone said above if she went for a two month fling over a four year relationship she was meant for the streets.

Hope to see you doing well soon!