HELP! Adding a 🦄 to your relationship?

So I'm bisexual and my hubby and I have been talking for months about finding a girl to add to our relationship. He wasn't very sexually experienced before we got married and we'd like to try new things together before we're too old! We browsed Tinder and accidentally found a friend of ours looking to be a third. The three of us talked, got really excited about the prospect and we hooked up one night. It was great and hot and we all loved it, and even discussed having one on one time with her. 
Now that the newly complicated relationship is continuing though, I'm having a lot of trouble handling it. I don't want to ruin the friendship between any of us, or my marriage, but I'm not sure what to do. Sometimes I'm really into it, not jealous at all, and would love nothing more than for our threesome to be a permanent thing. But other times I can't stand to think of either him or myself being with another person. He and I have talked about ending it, but part of me really doesn't want that. I feel so shitty because of my fickle feelings. 
Tonight is his first real date with her and I am trying so hard not to beg him to come home and call off the whole thing. What do I do??

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