What does it mean when I tell my boyfriend I love you and he sends a heart?

It means your boyfriend also loves you. But maybe your boyfriend is a very reserved boy. He is not good at expressing his emotions, so he replies to you with a loving expression. This is also normal.

Love, of course, means loving you. This is easy to understand. Also, your boyfriend may be working and busy, so he didn’t talk to you and could only send an emoticon instead.

Actually, it doesn’t matter what your boyfriend posts. What’s important is that the relationship between the two of you must withstand the test. What’s important is that he treats you well. As long as he is really good to you in reality, that's enough. It's thousands of times better than his expression.