JB said it all... It was not meant to be mean or rude. It is true... you have some major control issues regarding boundaries and you need to get it under control or you will run your daughter out of your life.
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I would not have interfered in the relationship, especially by communicating with him regarding my wishes that they break up.
That action alone could have just ended what trust and openness you had with your daughter and she may very well clam up and end communication with you. What teen wouldn't if mom is butting in the relationship?
She is 16... not a preteen. Trust that you have raised her well and she will make good choices. My parents never interfered in any relationship I had. They trusted that I was mature enough to figure things out on my own. You can' be making all of her decisions all of her life... you have to let go.
That said, she is 16 and they are not even allowed to be together unchaperoned? I am not saying it is ok for them to be behind a bedroom door in private but gees.. they need to grow up, experience the first love so they can grow emotionally.
You don't "teach" her to find her voice. You don't "guide" her to do things your way. This is HER life. Hopefully you have been a postiive role model in your role as mom and wife which would show her a healthy relationship and that comes without specific instructions. She probably thinks she can do nothing right and has low self esteem if you are taking charge of every aspect of her life.
No matter how much you don't want them together, if you are interfering you are pushing them together. They want the forbidden fruit.
Everybody has a 1st love... don't you remember that?
I would think that any bond the couple had with you is severly damaged at this point because you have made it clear that you don't trust them.
Do what you can now to communicate with your daughter, meaning LISTEN to her and hope she will open up to you again after this major flub. Apologize for butting in and allow her to make her own mistakes so she will be a better adult.
Out of curiousity, what was your husband's response to what you did?