Dear Grace
What an insightful, intelligent lady you are. I'm sure there must be many more situations out there similar to yours, where they just threw caution to the wind and plunged on ahead.
It seems you are being very careful and thoughtful about the future.
I think it is important to remember that you are not limited to just two choices: being alone or ending up with this gentleman. I also sense that you are a little concerned about your age differences. Maybe this is important even if a child were not involved?
Thanks again. I wish you all the best!