Is it normal for your bf to lie about a tattoo meaning?

so my boyfriend doesn’t know i know this because i happened to come across a picture on his computer of him with his tattoo and a matching one of it on this girls foot that he used to have feelings for. when we met i asked for the meaning of it, and he told me he just got it because it resembled childhood or whatever. i also asked if he had any matching tattoos with anyone and he told me he had a few and told me with who and which ones they were but never mentioned this girl and that they had matching tattoos. i’ve asked if any of his tattoos were about other girls and he said no. is this wrong of him to keep this from me and lie about the meaning? he’s lied about a lot of other things about his past they he doesn’t know that i know