<human>: Can you give me the gist of the text in a nutshell?

Hey Reddit. My boyfriend and I both go to the same university. It's the largest in our state, so a lot of people I know from high school are also here. My boyfriend and I have been dating for four months now, but we've known each other for a couple of years.

I feel paranoid. My boyfriend and I have both dated other people before each other. I know two of my boyfriend's exes, and he remains friends with both of them. I actually have no problem with this. I think the girls are pretty cool, and I trust him 100% with those friendships. But he has another past fling that I can't help these feelings of jealousy over.

They met while studying abroad in London in 2011. He said they tried a few dates but they didn't feel the "connection". That, or she went home to her state, far from ours and couldn't see him (that's how it feels to me). She texts him everyday. She's called him on occasion to tell him how her day was. They've been doing this for two years now. He would text her while I was literally lying in bed naked next to him. I approached him about it and asked if maybe he focus his attention on me during times like sex. He agreed. But I still see her name pop on his phone, even when it's 2 AM on a weekend night. It makes me feel crappy. 

My boyfriend says I'll have to get over it. I honestly wish I could. But whenever I see her post flirty things on his facebook wall or her name appear on his phone, I just want to stop hanging out with my boyfriend. 

Am I being ridiculous Reddit? Why is this ONE girl making me feel this way? I adore my boyfriend, but it's coming to the point where I'm not sure I can do it anymore. 

Any advice would be appreciated. I apologize if I'm being the crazy one here. I never intend to be.
<bot>: Boyfriend texts/calls a girl he used to have a thing with every day now. It makes me feel crappy to see her name appear on his phone at 2 AM.