Mom has found a "boyfriend" at assisted living.

I have been posting in these forums for a few years now journaling the problems and solutions we have encountered while caring for our now 91 year old mother. I think I may have written a short book by now and just when I feel that we have jumped our last hurdle another one pops up. I may be taking this event way too seriously but I'd still like to air out my concern if in fact there is one. My sister and I never thought our mother would actually adjust to assisted living as well as she did. It took a full 3 months of guilt and agonizing over whether this was the right thing to do. Then, it seemed almost overnight, mom stopped calling us 12 times a day and when we visited (which was every day) she stopped begging us to get her out of there. There was a man, George, sitting at mom's dining room table who suddenly took an interest in mom. We would come in and find them sitting together in the common room and whenever there was an activity, they would be there together. George is 85 and doing quite well on his own without a walker. He is very attentive and makes sure mom is getting up and down the halls safely. Then one day I pulled into the parking lot and saw George and mom sitting on a bench in front of the building. He had his arm around her and she had her head on his shoulder. I nearly drove into a tree. A few days later, I came into the common room and there they were happily holding hands. The head nurse called my sister and let her know that George and mom were quite chummy and wondered if we had any feelings about it. Between my sister and I we agreed that we had never seen mom happier and that we should just let them alone. They both have dementia, but it doesn't seem to affect their desire to be together. I just wonder how my mom will react if something happens to their relationship. What if George leaves the facility or decides he likes someone better? He is known to really like the women. Who would have thought that stuff like this goes on in a place where people just sit quietly alone and are barely able to amble along on their walkers. I have resolved just to be happy that mom is smiling and happy to be part of a couple again.