Pictures of his ex!?

Me and this guy have been going out for about 2 months now. He's the sweetest most caring guy I've ever met and we get along so well it's crazy! Him and his ex broke up in August and he says he's so over her and hates her now blah blah.... But I saw on his phone he still had pics of him and her together.... I asked him if he still had feelings for her and he could tell I was a bit upset about it and he was really trying to make things better, he deleted the pics and everything. But then I see him checking her snapchat story and she's his best friend in snapchat :( I feel like he's not fully over her yet and am doubting wether to end things or not? Please help girls xx