BOYFRIEND STILL HAS HIS EX GIRLFRIENDS ANNIVERSARY DATE IN HIS PHONE

So just a little background, we've been together for almost 2 years now. We have been pretty intimate obviously knowing each other for that long. He has always seemed to still talk to her and enjoy talking to her. I've noticed that he responds to her instantly but yet makes me wait up to 10 minutes between texts even when we are in an intimate conversation. (maybe I'm over reacting with that part). I don't know, it's just like she gets the priority over me. Now seeing that he still has their anniversary in his phone with hearts and shit next to it, just really bothers me. I broke down crying when I went home that day. Let me know what you guys think, maybe I'm just freaking out, but should I do something about it? Or do you think it's not a big deal? Thanks for the help!

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