My iPhone sending messages I've never even typed

I don't know what's going on. This has happened to me twice so far.
Last night my phone sent a text to my fiancé that I never even typed which made him mad cause he thought I was texting someone else and I wasn't.

Has this happened to anyone else? Cause this is the weirdest thing that ha ever happened to me. Or what going on?

Added (1). No I wasn't drunk and I didn't have the feature where it types what I say cause I never even said it.
And I was by myself so none of my friends sent anything either

Maybe you are accidentally hitting it and using the dictation feature that types what you say and sends it

Lay off the booze, that tends to happen when you drink too much. It's the only explanation.

Glitch in your phone. Take it to your cell store, they will replace it if you have warranty, which I hope you do. If not, you may need to get a new phone. If you are typing a msg to so someone and it sends to someone else, or is sending msgs on its own its the phone is defunct.

Your phone could have a virus.

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I don't think it's the phone messing up. Maybe some anoying friends getting a hold of your phone

I work in mobile tech and have done for the past fifteen years and i personally have never heard of this problem ever! I have not got a clue what could be the problem other than if someone has used you're phone without you're knowledge is this possible? Has it is the only feasible explanation.