<human>: Summarize the given text in a few sentences.

Me and my boyfriend have been together a year and a half. He is by far the best boyfriend i have ever had and I really see us heading towards marriage and kids.

Before I met him, he was seeing a girl. He told me that they kept it casual (fwb, fuck buddies whatever you want to call it) because she was moving away and he didn't feel it was worth doing long distance for. I never got the impression that she was "the one who got away", just that he enjoyed the sex and that she really enjoyed anal, something he is obsessed with and that I'm only new to.

Recently though, its become apparent that they are still in quite close contact. He doesn't seem to realise that I know who she is, and whenever she pops up on facebook he refers to her as a "friend". He also never opens their conversation or tells me what they are speaking about (which he does with everyone else). This makes me think they are having inappropriate conversations, or something flirty. She's also sent him a post card which made me very angry.
She knows he has a girlfriend, and she's in a different country, so I don't really feel like she is a threat. But I'll admit, I have been very tempted to snoop (we have eachothers passwords) but so far haven't.

A part of me likes that he thinks he is getting away with this, and is only flirting with someone he can't actually see in person. But it also makes me quite angry and at times has made me feel pretty awful during sex. For example if I refuse anal because it feels to sore, then at the back of my mind I am wondering if he wishes he was with her instead.
So should I confront him or turn a blind eye?
<bot>: Pretty sure boyfriend is flirting with ex-fwb in different country. She isn't a threat and relationship is otherwise perfect, should I bring it up or turn a blind eye?