He is an ass!

Last night, we had a long talk and I asked him if he ever cheated on me in these years. He told me he didn't but he admitted that he did flirted with some girls. He said it's just for fun, nothing serious and all guys doing it. He said I am the only one he love and the girls are nothing compare to me. I mean why he still doing this if he really loves me.
He flirted with girls especially when we got into fights or when he frustrated with something. This is bullshit! And there's no reasons to flirt with girls to make you feel better. It's just ridiculous! What do these girls think about me? They would probably think I am the cheap bitch who doesn't know her guy is obviously flirting with them. I feel so shameful, insecure and piss off at him. He said he felt guilty after all he was doing these things. Seriously, what do he take me for?
Ughh, what did I do to him to treat me like this?
I understand guys will do guys things but he's my man and everyone knows that we have been dating for more than 3years. If my family find out that, I probably have to dump him to save for myself from evil bf.
He thinks he's smart, chick-magnet and every girls would fall for him if he pull off his zipper, far more than that. haha
He told me he won't do this anymore and he will give me all his passwords when I move to S'pore. Let's see what he will do when I'm not around. He will learn it in hard way that freedom doesn't sweet without me.