Scared we made the wrong choice

My ex and I broke up mutually about 5 months ago. At first I was sad and just didn't know what to do about anything. She missed me dearly I know and we still stay in contact here and there. Last month and the month prior we were hanging out and starting to hook up and I could tell she changed a bit and I was proud of her. She mentioned getting back together and I said I'd consider it. A week later she told me she is going to pursue someone she met online. I was happy for her but not fully accepting as we were literally just talking about getting back together. I told her how I felt and she said she wants to see where this goes first. They hardly ever see each other and I know she's the type that needs communication everyday. Now during the time she mentioned the breakup I was spending a lot of time with my best friend as his Mom died very recently and also I felt pretty out of it mentally for a while during and after. Now she's seeing someone but it's quite complicated. He's in residency school and maybe can see her 1-2 times a week for a short amount of time and I know she's anxious about it. We still stay in touch and I can tell she is not used to having so much free time on her hands waiting for her boyfriend to maybe call her maybe not. I miss her and really wish life didn't get in the way but I have no control over what happens. It bothers me she's with someone else but I honestly would give it another shot with a new mindset completely. How relatable is this or am I dumb for even considering the option at this point. Also no I have not dated anyone since we brokeup but I have not met anyone I liked enough to date