Help with ex-girlfriend

I'm not posting this on r/askreddit or r/relationships because i get better feedback from here.

For about a month now I have been reconnecting with my ex-girlfriend after a year of not talking after a messy ending where I tried to kill myself. I saw her for the first time last night and I think it went well because nobody was sad or depressed or hurt. Nonetheless, I feel like I'm going back into old patterns like right now when she hasn't texted me in 8 hours I'm getting worried. She says that I freak out when she doesn't answer me, which is probably true. I want to keep texting and calling her to make sure she's okay, but I told her I would change. I need help

Update: her response after 2 messages i sent about not hearing from her for 8 hours: "I'm ok hun"