my boyfriend keeps telling me that he'll visit me but in the end he never does

i have been in a long distance relationship with my boyfriend for almost 2 years. we live in the same country but not in the same city, the distance is almost 300 km. we only saw each other once, it was last november when i went on a trip with my faculty to his city. but before that he kept telling me almost every month that he will come visit me and it never happens. at first i was understanding because he is busier than me but now i just feel sad, hurt and let down. a few days ago i started telling him how i felt when he mentioned that he might visit on valentines day. after that he became very distant and dry with texts. i don't know what to do or say anymore. i was hopping that we would talk about it and that he would reassure me but i clearly said something wrong.

Live in the same country different city only means one thing lack of effort.