hi.. my sympathy at the passing of your grandfather (( hug)))
..the carriage ride could have been a symbol to take it easy as well.......... a carriage ride is slow paced and relaxing verses driving a car etc..... know what i mean .....
and also i would like to add that our spirit guides can appear in our dreams as someone we would recognize....... meaning your " boyfriend" in the dream asking you out on a carriage ride , could have been your guide's way of sending you the message to take it easy.....take time out for you......

hope all this helps ....