Is that the only way to move forward--find someone else?
Definitely not the only way!
There are many of us here who are older and have chosen to move forward in other directions, going back to school to study something that interests us, volunteering with organizations that make a difference in the world, taking up an old passion like music or art or dancing.
There is a big wide world out there and so much to explore.
I'm sorry you have the heavy responsibility of caretaking your adult child, that is extremely difficult, and I hope you have a support system in place to give you some 'me' time.
Can you take short trips to somewhere nice just to get some inspiration?
Make a list of things you have wanted to do but couldn't because you've been so distracted by the aftermath of infidelity.
Choose one that really interests you and take steps to pursue it.
I'm engaged in online study as well as finishing a degree I started long ago. It's really stimulating and keeps me interested in the world outside men and dating.
I've been celibate for a long time and am quite OK with that.
Big hugs. This isn't easy but if you take the time to really look at yourself I think you'll find something you love.