You are right that nothing is ever 'permanent', and you can't know in advance.
But maybe, with dozens of people responding that 6 months was too soon + the reality of the fact that you have introduced them and 2 months later are now questioning the relationship after having been very willing to bring this man on a family vacation... You could agree that it was in fact too soon, no?
And that maybe your judgement on this new boyfriend was too clouded with your own feelings to make an informed decision on the best interests of your child?
I'm definitely not saying single parents can't date. Absolutely not.
I'm also not saying that you can't tell your child you're dating someone.
Hell, I'm not even saying that your date can't pick you up at the front door and meet your child, or that you could test the water by introducing them.
But the underlying idea should always be: what's best for my child? And not, how can I mould this situation to meet my needs, regardless of the impact on my child?
Ang again, in your reply you start off with the premiss of "how can I make my desire to date this man possible"?
The premiss should have been "Given my situation, is dating this man even possible"? And you should allow for the possible answer to be no.
A lot of single parents have co-parenting and child-free time or support networks or good babysitters. And they can arrange to date while their child is away. If that's not your situation, and you can't arrange any alternative, then I will stick to my statement. You should not be dating, for the sake of your child.
If you had come here to post how sad and lonely your situation had made you, and how you would love to date but feel frustrated by your lack of possibilities, I would have told you that I understand and validate your sadness. But I strongly disagree when you say that exposing your child was the only way.
No, the alternative was to choose your childs welfare over your desire to date.