My 16 year old boyfriend flirts alot via facebook?

[Amber]

My boyfriend whom is 16 and is also my best friend gave me his facebook password awhile ago. I never really considered stalking him but a few things came up on my news feed and i was so tempted to just see what was going on. I found some things in his inbox with girls pretty much acting as if he was single e.g. "we need to turn this down a notch because i like you and i don't want to ruin things more with amber", "i wouldn't tuned you if i didn't have amber", "i couldn't get something from you if you know what i mean cause you're fucking hot" , "i'll smash your box" and he told another girl before we went out that he couldn't decide between me and her. He also told one of his guy friends 'i hope my girlfriend puts out soon'. I confronted him with the things he said to the girls as they were obviously hurtful. He said he'd stop and claims he was 'hacked' which i know is complete bullshit although he admitted to saying he wished i'd put out. He claims he doesn't really mean it and that he'll wait until i'm ready. He was a well known flirt and he still seems to be despite me confronting him. It's not at the level he was at before but he comments on girls photos with things like (.Y.) and "putting sprouters on lay by", "you're fucking hot" etc etc...

i want to know if i'm over reacting or if you'd also feel hurt, i also want to know what to do about it since it makes me feel about 500 times more self conscious and as if im being compared to these girls who are perfect. It's a different story when im actually with him, although he calls girls hot when watching movies and some of my friends as if it's not big deal...
AHH HELP?!l?>:>';FRBGRTGDB
*could get things from you