There are several possible reasons why an ex-boyfriend might suddenly stop contacting and ignore their partner after ending the relationship, even if they were very much in love before:
Emotional coping: Breaking up can be emotionally challenging for both parties. Some people cope with the pain by creating distance and cutting off communication. Ignoring their ex-partner might be their way of dealing with their own emotions and avoiding further heartache.
Personal space and healing: After a breakup, individuals might need time and space to heal and reflect on the relationship. Cutting off contact can be a way to gain clarity and work through their feelings without distractions or reminders of the past.
Avoiding conflict: In some cases, avoiding contact might be an attempt to prevent arguments or conflicts that could arise from discussing the breakup or unresolved issues.
Moving on: For some individuals, cutting off contact is a way to facilitate moving on and starting a new chapter in their lives. Maintaining communication with an ex-partner could make it more difficult to detach emotionally and move forward.
Respect for boundaries: If the other person has asked for space or no contact, the ex-boyfriend might be respecting their wishes, even if it's difficult for him.
Protecting feelings: Continuing contact with a former partner might reopen emotional wounds and prevent both individuals from fully moving on. Ignoring their ex-partner could be an attempt to protect their feelings and avoid getting stuck in a cycle of longing for the past.
Fear of reconciliation: Staying in touch might give rise to hopes of getting back together, which could be problematic if the ex-boyfriend believes it's best to move on separately.
Other circumstances: External factors such as new commitments, changes in personal circumstances, or the influence of friends and family could also play a role in the decision to stop contacting an ex-partner.
It's important to remember that every individual and situation is unique, so there could be various reasons for this behavior. It's essential to respect each other's boundaries and give both parties the space they need to heal and move on after a breakup. If you find yourself in this situation, focus on your own well-being and surround yourself with a support system that can help you through this difficult time.