Am I the Asshole?

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The original was posted on /r/amitheasshole by /u/ThrowRAcringe123 on 2024-01-23 22:01:17+00:00.

My sister knows her husband has a crush on me, it's been going on for years, and I went no contact for a few years in the past, partly due to this. She's aware he's obsessed with me and is fine with it.

I'm cordial with him and keep him at arm's length.

A couple of months ago I shared with family I'll be divorcing my husband. He started giving me and my kids gifts and vacation plans valued in thousands of dollars, that my sister is aware and approved. A couple of months later, he sent me private texts, expressing his love to me.

I asked him to stop texting me and stick to the family chat for communication.

Will I be the asshole if I showed my sister the texts?

She's happy in her marriage and he's a good husband to her (as far as I know). I'm worried that since she already knows everything and is deciding to rug sweep it all, the texts will only cause drama, and create a rift between us.