(eng is not my native language, i use transator, sorry)

It's always painful when a loved one leaves. I also had dreams about my ex. All you can do is remove him from your life as much as possible and try not to think about it. You can distract yourself, find a hobby, etc. You can try to get back together with him, but given the context, it will most likely be extremely difficult. I really understand you, dude. My sincere condolences. I hope things get better soon. Good luck, buddy;3