Hi doggie, isn't this: "he's not anything but a friend that I text" really what it comes down to??. You texted him as a friend!! You texted a friend!! Now how could that possibly be wrong at the time you did it?
OK his fiance might now be upset, but you know there were no bad intentions on your part when you did it.
Now it's all much more about their relationship than it ever will be about you.
Maybe his fiance is feeling insecure in the relationship, maybe it's just one of those boundaries she'd like in the relationship that he doesn't remain friends with ex's (although for some people it isn't an issue- so how were you to really know?).
And come on, where's his responsibility in all of this??!! If he kept up the communication......??!!
I could say, it's alright, now you can move on and/with lesson learned. But I'm thinking that this runs deeper though?? Maye about the way you feel about yourself in general?? You do sound really hard/down on yourself. If so, have you got anyone you can talk to? Are you getting any professional help??
Although if you want to talk a bit more about it/how things are for you.................
Alison