HELPPPPPP EMERGENCYYY BF ADVICE QUICKK !!!! 10 POINTS FASTEST ANSWERS.?

Hi so im 14 and hes 15, we have been dating for about a month. Nothing too sexual that we do we dont take it far like really far. But Im trying to get over his nasty history with his ex and girls how hes had sex with a girl in the girls bathroom and school and how he had sex with another girl at a kohls clothing store in the dressing room. It grosses me out cuz those girls could have been nasty and could have gave him nasty diseases which i may catch if anything like sex happens and also how he didnt use protection either. ( HE admitted to the one with dressing room incident)

-i need your opinion

THIS ISSUE:

He always has my phone and always goes through it like just random like let me see your phone common. But when i have his he like freaks and is like now. and he clicks off his screen and exits out to the home page on his iphone when im like near like wtf. Like i wanted to check his phone today in class and he was like noo say right here and play temple run and i was walking away trying to check it and he was like noo and took it. SOO NOW i will not let him see my phone because thats not fair.

-I asked him if he was hiding anything and why he freaks and he said because hes embarrassed of his moms music.like when i had it hes like stop im lisetening to music i need to see it.( maybe i think its was his moms old iPhone 3 which she probably gave to him)

-Do you believe that??

He also used to flirt around and i confronted him and he completely stopped flirty. Do you think thats shady?