My boyfriend text a girl friend nearly every day?

So me and my boyfriend have been together for four years and have recently started talking about marriage. About a year ago he started talking to his best friend’s little sister which he has not seen in person since he was like 13. She apparently found his instagram which is very hidden and he doesn’t have many people on it along with a username that isn’t his name…so how she found him is news to me lol. Once she found it she started messaging him. Since then she is now not only on his instagram but his Snapchat and has his phone number. I don’t worry about my boyfriend cheating at all he is very very loyal. But I worry about this girl. She is constantly texting him daily. She has even recently asked him for money which he said no too. And when I ask what they talk about or why he talks to this girl he hasn’t seen since he was a kid and doesn’t really know. He says he sees her as a sister, that she’s an old friend, and they just talk about life…which I find odd because it’s everyday. Should I be worried about this? I’ve mentioned how I’ve felt before and he thanks im just tripping. Also her instagram is nothing but selfies of her half naked and I’ve had to ask him to stop liking her photos as i felt uncomfortable with him giving her that attention. Not that he still doesn’t see them. Idk…

My boyfriend text a girl friend nearly every day?
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