Advice in what to do in my (F17) relationship with my boyfriend (M18)

TW

hey, i’m coming to get some advice on mine and my boyfriends relationship. we’ve been together for around a month and we’re in a long distance relationship. his ex tried to follow me on tiktok earlier and when i asked about who she is he told me she was his ex. i was abit shocked and confused as to why she would try to follow me. i spoke to him about it and he wasn’t being very reassuring. i tried to speak about stuff with him. after about an hour he started ignoring my messages and calls and came back and told me that he had sh. i’ve tried to ask him to speak about it but he refused and told me “not to worry”. i’m upset and it was difficult for me to be vulnerable with him and it seems like he didn’t really care about how i was feeling. i’m not sure on what to do and i just want someone’s advice from a different perspective as my friends are caught up in their own life’s. tia