The mobile phone number has changed, and my husband doesn't know. I want to pretend to send some short messages to Doby.

Don't you trust your husband? The minimum between husband and wife is trust and respect! If you do this, you don't respect or trust him, but you don't believe or respect yourself either. He is your husband, but you don't trust him. Tests and temptations should be done before marriage. Your husband didn't do anything wrong to you, but you found fault. This increases the number of mistakes. If he knows, there will definitely be a gap between you, which may cause more serious things to happen.