Would you be upset?

Me and my boyfriend haven’t been together long however it feels like it’s been a lifetime. A few weeks ago, the girl he lost his virginity to, her mom text him and was like i hear you have a girlfriend aw i wish you the best blah blah blah. I helped him write a response and it was fine. Well today, the girl sent him a photo of them one year ago today... i’m upset not with him with her. As a girl you think she’d refrain from sending him this like she’s older than him so i feel like she’s playing games with his head?? He’s been really good since the message came through and has really reassured me but i just wanted to sound off. He’s amazing and i’m so scared of losing him, he’s my first boyfriend and i’ve put a LOT on the line for him...