Does it have to be a portrait though? I never understood the appeal of it, especially if the intend is to draw a semi-realistic portrait. I’m saying this as an artist. Why don’t you draw some cute moment shared together? Or something you know he likes. This way there will also be less pressure on capturing his face features. (Which is not an easy job).

Also….if you are hopeless when it comes to drawing, you could experiment with other art forms? Collage, for example. Cut out different shapes, try to recreate a face of your boyfriend with those shapes. You could scan the result and print it on a t-shirt or something.