If your friend and his girlfriend laugh at you, then you should find better friends who care about you. Don't worry and overthink, do what you feel needs to be done and you'll have respect for yourself having done so. Say thanks for the memories to him and move on, don't let your mind force you into a state of inaction. What they may think won't matter to you because you won't see it and if they did react that way they're not worth knowing anymore.