My fiance is defending another woman?

Me and my fiance have been together for almost 3 years. We were high school sweethearts, broke up and found each other again. Lately, hew been defending his female coworker. Him and her were texting, I found out and then he immediately started erasing texts. Im supposed to be ok with them texting and sending smiley faces and shit. Im not cool with that. When I say something, he completely blows up and starts calling me names and defending her even more.

What's really going on here?

My fiance is defending another woman?
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