How to rebuild trust in a relationship... when you didn’t do anything?????!

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I kept an old pic of my ex and my husband saw it now I’m a cheater now he doesn’t trust me now he wants a dna.

Really???!

I’m a good person never lied or cheated on him- I’m 29w 4d pregnant

In and out the hospital and he’s acting like an ass... I’ve apologized for the pic and deleted it and did it means nothing and he’s still holding on to it!

So how do I get him to speak to me and trust me