What will most help you understand what is being said here is to recognize that there is a typo in the original sentence :) It should say "and my boyfriend of course", instead of "or course". 

Of course is a common phrase used when something is obvious, or should be expected.

Valentine's Day is about celebrating love. If you have a boyfriend/girlfriend already, you may be expected to give a card or gift.

The speaker said they send cards to their friends, and since she has a boyfriend, she'll definitely be sending him one as well.

Hope that helped! :)  

Thank you Savannah!

So, this sentence is wrong! You mean it should be " my boyfriend of course!, Am I right?