My foster kitties are breaking my heart. Advice please :)

I'm not sure if I am in the right section. this is my first post and it's 3 am so I'm a little loopy but can't sleep due to anxiety about my foster kitties.
About a month ago I took in my first 3 foster kitties at 4 weeks old. They are now about 10 weeks and still with me. The organization I got them from are working hard on finding them a home but the thought of breaking them up is breaking my heart. I know no one is going to adopt all three day in and day out I watch them play and love and cuddle. I feel awful because one minute they are loving life with me and then the next bam they are all going to be separated. I guess I didn't think this through when I decided to foster because instead of feeling good about it I'm feeling sad and guilty and stressed! I wish they would have given me a family in even numbers so I could at least send them off in two's but they didn't.
I just can't forgive myself at even the thought of separating them or even worse only separating one from two!
I love them a lot and want to keep all three myself to avoid this separation but I already have three of my own. 6 cats is a lot. I keep trying to rationalize it in my head but I know in the long run I'm just going to be broken hearted and miserable.
If I sent two off to a new family do you think the third would be okay with just me? I don't know what to do.
Does anyone have any experience in this and is willing to send some advice.
Thank you

Hi @Puggleperson

Why not keep one, and then the other two can be adopted together?  Talk to the rescue group, say how bonded they are and ask if they will commit to doing a pair together, and if yes, that's great, and the single one gets to stay with you and have the company of your other cats, which makes 4, better than 6.