To say that I love you and to make you feel that somebody loves you, are different things. I think this gap exists in your relationship. I do not understand one thing, on one hand he says he loves you and on other hand telling you not to take relation seriously! Worries about your loved one’s future are very natural in its occurrence and here that natural occurrence is missing. Not only that, it is not a matter of concern even on your insistence! Both of you should reexamine your relationship and love. Is true love exist or it is only a need based relationship? You may not like this as you seem to be deeply in it but you need to consider this. You should take it as a third eye view.