"I dont want my wife to develop an serious emotional attachment to her lovers."
--If she had to ask her lover for permision first to marry you, why didn't she just marry him? Her feelings seem to be stronger for him than for you as if she is using you for maybe someone whom pays the bills buys her stuff,but from what you said he does that as well.
"It is one thing to "love" someone, but not "be in love"."
---It sounds like she loves you but she is in love with him after all last weekend you left her with him and she stay with him and came back for a few days than said I am going to spend the weekend with him. If she was in love with you and wanted to show her marriage was the most important thing in her life,she should have stayed home. If she was breaking it off with him spending the weekend wouldn't be it.-----
"I know I am splitting hairs here, but at this point it is needed.
On the other hand, I dont want her to be "used and abused" as a piece of meat.
It comes down to RESPECT.
I want her to respect herself, and her lovers to respect her as well."
---Sorry but when it comes to a room full of guy fucking her that have nothing to do with dating your wife,you are used like a piece of meat. I have had a few gang bangs and it is pretty intence but not for once was CIP thinking 'Oh no there not making love with her they are just fucking the slut." Thats exactly what we got out of it. Pleasure from all. I wasn't there to cuddle and I don't cuddle with other guys I mearly use them for their cocks. If they can perform great if not I won't ask them again.----
"But, that being said, I am faced with the fact that I may not have any input into this at all."
---As her husband if she is really in love with you you do have a choice you do have imput. If she is not really in love with you cut your losses now before you loose it all. She should be supporting you not through you to the curb when she wants to be with him which seems to happen often.-----
"My choices are to shut up and go along, or face losing her all together."
-----What are you really loosing here. Someone whom doesn't support you at all,walks out to be with him when things are rough between you two. -----
"At this point, the wounds are too deep and too recent to make any sudden movements."
----I agree but if you want this too work between you two you need to put your foot down now. No more sexing others till your issues are resolve and if she really love you she will let him go.------