To not go on walk?

[Magicra84]

I had arranged with a friend to go on a socially distanced walk which we've been doing since the rules were reviewed (that you can go on a socially distanced walk with one other person from outside your household). She then announced she had invited a friend. I have done lockdown to the letter, not mixing with others for two months apart from at the local shop. I am now not going on the walk as although I know the risk of contracting Corona with one other person on the walk is low, I just don't want to break the rules I have adhered to so far (and usually I'm a rebel!).

You don't have to do anything you are not comfortable with. YNBU

YANBU for the fact alone it was inconsiderate and rude to invite someone without checking. Stick to your guns OP.

Just do what feels right for you OP. It's only a walk, I'm sure you can just go on another with your friend at another time.