Not saying I love you

so I was texting my bf and he was having a hard time so I said "I love you with all of my heart" and he just said something else about being sorry for being upset. later on he was going to bed so i said i love you and he sent me a heart sticker thing but didn't say the words. is this concerning or am I overthinking it? should I confront him or just see if he avoids saying it again?