It hurts if this is true, you need to be careful and more sensitive next time.
I guess many who replied did not understand what the OP is trying to express here due to the poor way of construction. However, based on my understanding of what is being conveyed, the OP never sent any money but was actually expecting payment through his BTC address, and mistakenly copied a wrong BTC address which eventually got the paying party angry or suspicious thereby terminating the payment.
Who is to blame here? The OP and the paying party of course! OP in the sense that he/she shouldn't have made mistake with the address. And the paying party in the sense that they should have been emphatic about the strictness of the BTC address needed, and told him/her to change the address to the preferred one.
Whoever decided this was a good idea is a MORON. (and me too now but damn)
Not at all, such people are even genius because each of the addresses has its benefits.
I usually do both, the first few and last few but I mainly always went by the first few digits to make sure I didn't accidently copy/paste wrong address.
Which makes it your fault. With different BTC addresses for different purposes, I always used the BTC address that is from a centralized exchange for any financial transaction that deals with companies or parties that demand my trust. Sorry, you learned the hard way, you have to be careful while copying and pasting addresses next time.