Yes, there is a way to do this - but there is a risk as well. If the two cameras are not 100% compatible, viewing the photos/videos made by one camera on another can corrupt the card - and you could lose all of the photos/videos on the card. Basically, each camera has a unique folder under DCIM.
You would have to move the files from one folder to the other to see them by the other camera. And the files must be in the proper naming sequence, as well as support the resolution and size of the other camera. That you are having some issues already suggests to me you do not have 100% compatible cameras.
If you have a PC, the far safer way is to download the photos onto the PC and view them there. If you don't have one, then you will need to both have 100% compatible cameras - essentially the same model. And after all of that, you might even need to delete the database in the root directory of the SD card.
So while it is possible - it is not necessarily easy - and does carry some risk. Far better to just view them on a computer if you have one.
If you put the sd card in the computer you can view the pictures and that is the easiest way to send them to your boyfriend.
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