Feeling lost

Hi guys. I went through a super bad breakup last year, we had two miscarriages last year and she freaked out and left me. It took a long time to feel kind of okay again but I met someone who completely had my back and supported me through everything, we both started to get super strong feelings towards each other but I was hesitant because I still felt a little heart broken. I asked her out on the weekend and she told me just started seeing somebody, we have both been in tears and upset since we can't communicate properly now. She wants to try things with this guy and now I'm left feeling completely alone and heart broken again, I'm sick of not getting sleep and feeling like garbage, the anniversary of the miscarriage is coming up and now I don't have her I'm an emotional wreck. Any advice on how to try to improve myself and my mental health? I feel like I should cut her off but it's very unfair on us both and has left us both very upset. Thanks :(((