He says: I performed Hajj this year and I was messaging my fiancée from time to time to reassure her about me, knowing that there was no extra talk or flirtation.

Did I fall into rafath or fisuq? And is my Hajj accepted?

First, if she is a fiancée, meaning not a wife and there is no marriage contract.

Then it is not permissible for him to talk to her or message her and so on, whether during Hajj or outside of Hajj.

She is a non-mahram, and all that is between you is a promise of marriage.

Engagement is just a promise of marriage; until now, the marriage has not taken place, so she is a non-mahram.

So it is not permissible for him to speak to her or correspond with her, that's one thing.

But if, by Allah, we've now reached Arafah, we've left Arafah.

We're now going to Muzdalifah, we'll throw the pebbles, just like that.

Fine, inshaAllah this is not considered indecency, but the important thing now is to cut off the relationship and get married quickly.