I need helppp

Okay so me and my ex both met during the summer for band and clicked instantly. When we started dating, I had no worries and he made me feel so loved everyday. But then my grandfather passed away which took an emotional toll over me and it kinda affected our dynamic since I wouldn’t talk as much. I said we should take a break and we promised each other to find our way back, but two weeks after, a girl that knew and encouraged our relationship backed all friendly and wanted to be soooo close with him and more. She invited him to chill at her hotel and when he told me, I know we were on break so I couldn’t be super bothered, but I was upset so I started talking about him in a manner that was rude and I have apologized for it, they’re now dating and I considered the girl a friend as well so it’s like ughhh mentally draining. But, he said he believes in second chances and I feel like we could start again in the future. I don’t wanna seem crazy but I will wait on him. Should I wait and see what happens or something else idk?