The fact that your husband continues to talk to "Elly" is a bad decision on his part. He needs to consider your feelings before Elly's. As a wife, you are #1. You told him to stop communicating with her, yet he continues to entertain her. You cannot let your husband treat you like this.
Also, there is no such thing as "jealousy" in a marriage. You both are husband and wife. Everything he owns is yours, especially his cell phone. You have a right to look at it whenever you wish. Only a suspicious husband that is cheating would object to you looking at his phone.
I find it funny how some men want "privacy" in their marriage, just enough to cheat on their wives. Please don't let your husband have this power over you. You are equals. You can talk to him and resolve this. Remember, "Elly" is a drama queen. She cannot be allowed to orchestrate this drama upon your lives. Just like she entered your lives, you can make she leaves just as quickly as she came.