thank you!

Hello,

My friend and I send each other BTC via electrum often, and have done so for the last few months, and we have each other's contacts saved. Today I attempted to send him some money, and he usually receives it instantly. He checked his receiving address and it is different than the one I've been using for the last few months. I was just wondering if this will effect whether or not he gets the money, does somebody else have his old address (the one i've been using) now so they got the money, and if I can cancel the sending/get my money back?

Thank you for your assistance.