Hurt by my boyfriends actions

I have been dating my boyfriend for about 1 year, before that we had been together for 6 years, broken up for about 9 months in between, when he decided I was too busy to give him what he needed and found someone else on a dating website. I feel like he cheated because he went out with her before he broke up with me, he disagrees. In any case, I decided to give it another try.

Yesterday he responded to a comment a girl made on one of his Facebook posts with the following:

“Do you have a little Irish in ya? If not… ya know.”

He tells me he was just joking and I am being too sensitive, and that it doesn’t mean anything. He said if I can’t handle him playing around on social media, we are going to have problems.

I feel disrespected and hurt, I feel like I will never be enough. I think this may be the last straw for me, and it may be time to end it.

Am I wrong to be hurt?