Smoking opinions

so my boyfriend is a casual smoker, but he told me he would stop because I hate it so much. well he continued to occasionally smoke, and I just don't understand it. he told me the truth but I'm still hurt. he says it's relaxing and he doesn't do it often, but he must do it enough that he doesn't want to give it up? so I'm asking for your opinions on what to do; keep trying to get him to stop or let it go?