I try to view those upset moments as an opportunity to bond more deeply with my friends. Sugar and spice bonds built on nothing but the good times are shallow, at best. Bonds deep and strong enough to carry a realistic load don't begin to form until we feel comfortable opening up and letting our troubles through. "Ears open. Mouth shut" is a mantra which helps me survive the uncomfortable moments without shutting them down. Sometimes I start mentally singing a John Prine song as I listen to my friend.

"No you don't have to sympathize
"Nor care what they may do
"But everybody needs somebody that they can talk to."

But that is me. . .

Gentle support while you find what is right for you.

It's difficult. I know for us, to get time alone, we had to schedule it in advance and do it quietly to avoid all the drama.

I've had moments like that, it becomes especially difficult when you empathise with those who feel excluded because you don't want anyone to feel sad or alone.

As arfie said, friendships grow stronger through the hardships, this includes moments when communication becomes difficult and uncomfortable leading to altering the status-quo.

In this situation I gather that you have friends who have openly said that they feel left out or jealous when you are one-on-one with your friend. This is good as they are in a position where they can clearly express their feelings and emotions and be listened to. You would like the same from your friends too and I'm sure they would want you to feel like you can express yourself especially if they're good friends.

I find its nice to talk one-on-one with friends sometimes as you can have deeper more thoughtful conversations, not only that but its easier for me as someone with ADHD because I can clearly focus on the sole person and don't miss out key conversation points.

Mid made a very good point in that sometimes it's worth taking opportunities at hand and seeing friends one-to-one when you can without confirming with the others because you are two individual people with individual minds who have chosen to take some time together as just you two!
It sounds harsh but you don't owe your friends anything in that regard because It's none of their business in that moment plus there will be plenty of other opportunities to see those friends later.

You know yourself that you don't think of the your friends any lesser than just because you want to see then individually and as time passes they will come to know that.

At the end of the day this is a perspective for you to read but please go with your gut feeling and what is right for you, things will fall in place :)

My friends know that they are special to me. I spend individual time with friends all the time. I would explain to the jealous ones that each friend is special in their own way and that spending individual time with a friend doesn’t lessen that value and that some friends need more support than others. Assure you jealous friends that you value each and every one of them.

Sometimes you just have to ignore their feelings, you can't help what they are feeling and you aren't the one making them feel that way. They will get over it. Remind them of the last time you spent time with just them and how nice that was. A threesome of friends together is often awkward, someone alwasy feeling left out, so that's why it's nice, one on one sometimes. <3

Isn't our humanity great? Friendship is sacrificial, at least our deepest friendships are. Perhaps this is the conversation you can have with the friends that are jealous. Honesty with everyone usually gives us the best results. My guess is that all your friends are wanting individual time with you. Are you able to communicate to these individual desires and draw some tolerance and better understanding?

I use to judge the quality of my friendships until I realized some don't have any.