My bf lied about his daughter

Me and my bf have been in a relationship for about 6 months now but we were talking for about 2 years off nd on i finally got him to commit but thats another story anyways i was doing some investigating on his ex page ( im crazy ik) but i found out the daughter he said was his is not even his when im questioned him he told me he didnt want me to get mad because when they were dating he thought of the girl as his daughter nd didnt want me to make him stop talking to her . But  throughtout our relationship he lied saying his daughter move states thats wjy doesnt see her and even way back in the day i remember days he said he couldnt see me cause he was with his daughter now im thinkking was he lien? Or was he reay with this lil girl and her mom?  Am i just trippin is this sumn little?