confused1976,
I'm going to suggest a simplified approach that plays off only those things that you do know and what has happened between the two of you since you brought this up to her. This simplified approach accounts for the likelihood that your actions have been compromised. That is not good, but it is not the end of the world either. In fact, IMO you shouldn't even bring up the VAR order being brought up on your computer (more on that later).
1. Have a follow up conversation with your wife:
"I have given thought to our last discussion and what you said about my concerns"
2. State your fundamental issue: "As your husband, I have a problem with you maintaining contact with a friend from your past who now professes to love you, invites you to one on one meetups, to include a concert"
3. State why this is a threat to your marriage: "I've seen no evidence that you shut down his advances. This, coupled with not telling me, has created a breach in my trust"
4. Lean into her previous statements: "You said that you could see why his words and your actions could lead to a misinterpretation. I consider this to be minimizing the gravity of the situation on your part. As well, you invalidate my concerns by stating I have misinterpreted the meaning of him saying he loves you, him inviting you solo to a concert, you not shutting him down and you maintaining contact with him."
5. State the remedy you need: "I need you to expressly state to him in a written message (approved and verified by me) that you can have no further contact with him and you must block him on all platforms. This action on your part is a critical step in restoring my trust in you."
"You state that he is a friend, notwithstanding his words, and your actions in response to his words, that indicate it is not a platonic relationship. Your relationship with him does not enhance our relationship and our marriage. He stepped over the boundaries of your friendship with him by expressing his romantic intentions. You stepped over the boundaries of our marriage by not shutting down his advances and maintaining contact with him."
6. State the need for her to make herself accountable for restoring trust: "You state that I have misinterpreted the messages I read. As I previously stated, I strongly disagree with your assessment of the messages I read. Further, the content of those few messages read as if there were other messages. The context of those few messages is "off". Pieces are missing."
"Your actions, not words, will be the means I use to see if you understand the gravity of my concerns. Certainly you can hold fast to your notion that I have misinterpreted your friendship with a man who has expressed romantic intentions. That will tell me that you place a higher value on that relationship than me, your marriage, and your family."
"I cannot, and will not, control your actions. However, I will not accept you maintaining a relationship with a man who has told you he loves you."
7. Do not bring up the VAR(s), GPS, any surveillance of your computer. Instead, hope that she does and state: "That should signal to you my deep concerns about the gravity of this threat to our marriage. What are your reasons for having SIM cards which essentially means you have multiple phones using one device? Are you willing right now to give me your device, give me the SIM cards, and unlock them so I can read your messages?
As always, preface everything I write with "IMO", and conclude everything with "YMMV".