Whats the meaning of a guy put a pic together with a girl in his house and learn her language?

I met a guy who just broke up from long term relationship and we started getting closer after know each other, but he kinda 'warn' me that he's not interested in a relationship and i was fine cause i wasn't looking for a boyfriend either, so later on we become friends with benefits.
Months later he told me that he has another friends with benefits after with me and concern about me if im ok with it or not, i was jealous but in the end i keep doing this with him.
When i came to his house, i saw a photo of him with a girl in polaroid and put it on the wall, and a whiteboard with another language (i assume the girl is different nationality, and its not his ex cause i know her face).
Does it mean she mean more to him or they're in a relationship already? Eventho he said he doesn't want a relationship. If he does, that means he cheat with me from her right?

Recently i feel like im just like a booty call for him cause he come to me when he needs me. I thought i can do this without feelings, but i was wrong. Now im trapped to stay or go, since im single and craving for a real relationship.

Whats the meaning of a guy put a pic together with a girl in his house and learn her language?
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