My boyfriends lock screen and home screen is him and his best (girl) friend. Is this something I should worry about?

DreamingOfBlue
I've been with my boyfriend for almost 3 years now and I love him so much. We live together and showered watch other constantly in affection. He's told me he loves me so many times, but I still get jealous of his best (girl) friend. He almost always seems to be talking to her over text, and he even have photos of them as both wallpapers on his phone (I have him as mine). I've told him before that I am jealous and he says not to worry, she's not his type/she has a boyfriend. I do trust him, but that doesn't stop how jealous I get when he just typing away, smiling at his phone with me next to him.

Is it alright to be jealous?
Updates
+1 y
EDIT (7/4/2020)

Everything got cleared up. I took some of your advice and talked to him. They have been friends since before I met him, and he only sees her like a sister. That, and I'm going to be hanging out with both of them in a week because she's coming over. He wants the two of us to be friends.

Thank you everyone for your input!
My boyfriends lock screen and home screen is him and his best (girl) friend. Is this something I should worry about?
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