Adding to the equation ??

My boyfriend has expressed to me that he doesn’t feel pleasured when it comes to having sex. He feels as if my vagina isn’t tight enough for him. I’ve tried creams, wands, & pills but doesn’t seem like anything is working & the creams are hit or miss. Sometimes he ejaculates & sometimes he gets up without. And that’s when he gets out the mood. Now me being in my late 30’s I’ve NEVER had a complaint about my vagina, even with the smallest penis. I’ve looked into doing the vaginal rejuvenation & I’m currently doing pelvic floor therapy. He wants to add another female (sex wise), not into our relationship but just someone outside to make him more fulfilled sexually in the meantime. Although we have a married couple that we’re friends with who has someone occasionally for the both of them I don’t think what works for them will work for us because I’m territorial & I’m not the one who wants to have sex with anyone else, it’s only for him. Everything else in our relationship is top tier. I don’t want to be selfish but I don’t want him to have to go somewhere else either. I just don’t know how to go about the situation. I know there will be ground rules IF I decide to put my pride aside & let him. Sounds stupid af smh but I don’t have any other options at this point. Any advice on how to handle this situation? No negativity please.