My ex broke up with me and idk really why but we were so happy and the relationship was so good so after we stayed friends and still talk. A month later he texted me say he misses me and he regrets ever leaving me and he is really sorry and that I probably already moved on. I told him how I felt and then said do you want to maybe try again he just said we can’t . I asked why and he said because. Like I’m so confused and I really like him it’s a week later now and I just can’t stop thinking about it and idk what I should do. Should I try to get him back or just walk away and leave him alone. Any advice would work please I just need help.