Why not before ?
"They were having such a good day, I didn't want to ruin that for them."
Why'd you put it off again ?
"They were having a bad day, I didn't want to make it worse."
What's your excuse now ?
"We were having a good time, felt like things might work out."
You know when the right time would have been ?
WHEN YOU FIRST REALISED YOU DIDN'T FEEL THE SAME WAY ANYMORE.