I f*cked up? Badly?

So my friend found this guy off of tinder and I started texting him because he was sketchy... turns out he had a girlfriend. I should’ve left it right there but I didn’t. We continued talking (me under a fake identity) and we instantly connected. I’m about to tell him the truth... but I’m terrified I’m letting a soulmate go but at the same time I’m engaged, I honestly feel horrible and I don’t know what to do. (Also my fiancé knows about everything except my feelings). Any advice would be great.
I f*cked up? Badly?
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