I don't know, Ron is very stobborn, even more than Hermione, and he has a very short temper and as you can see he clearly is not the type of guy who would propose his love for a girl, it's the other way around. Besides, after all the things that Ron did for Hermione (the slugs, loosing temper in the QWC, Snape's temporary DADA class etc) one can hope that Hermione should be the one to confess her true fillings first.