Boyfriend trouble

So yesterday I was with my boyfriend and he wanted to go through my phone so I let him but then I was like if you’re gonna go through mine let me go through yours, so without any trouble he handed over his phone, I didn’t find anything until I went onto Snapchat, I saw 2 conversations with 2 different girls, in one of the convos to one girl he was telling her he gets out of work at 10:30 so that made me think he went to go see her that night keep in mind this is the same night he wasn’t able to come see me because he was with his “boys” he sent me pics to prove he was with his boys but still, the second convo he swiped up on a girls selfies and said she looked pretty and i saw he was sending her kissy faces, I didn’t read on cause I got mad, he insisted that they are just friends and I broke down in front of him and started crying , he then told me he had to leave, he left me there crying, now he’s telling me he’s sorry and that he loves me and wants to be with me, but I’m just hurt, would you guys consider that cheating? I just need some advice please. Also he didn’t think what he did was wrong. He looked me in the eye and said “all I said was that I thought she looked pretty” that hurt me so bad. And one of the girls apparently lives by him. Also he didn’t want to show me his phone after I saw everything