Am I wrong for saying I'd text the lady he cheated with?

So my boyfriend and I got into it. I told him I was gonna text a lady he cheated on me with because she kept texting him even on vacation about a baby and I'm like does she even have a baby? So he kept saying no but she was very persistent. I told him I was gonna text her off a random fake number but he got mad and was gonna withhold an engagement ring. I didn't know what was true or not, but I didn't wanna be committed to someone that had a baby on me. I forgave him for the cheating but I don't know.

Am I wrong for saying I'd text the lady he cheated with?
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