Please send a message to tell my boyfriend that I still love him. Why didn't he reply?

There are several possibilities for this at first, because he didn't see the message (maybe the phone is dead, it may be turned off, and so on). Secondly, because he was angry with you, he deliberately didn't return, to see if you would take the initiative to call him. Third, because he has been hurt by you, he doesn't want to talk to you anymore. Fourth, he is in love with someone else ... for whatever reason, if he really loves you, if he deserves your love, he will definitely send you a message or call you back. It's yours anyway. If not, don't be forced!