Yes, it is possible for someone to move on and start dating someone else because they don't want to be alone, even if they have forgotten or are no longer thinking about their ex. People cope with breakups and loneliness in various ways, and dating someone new can be a way to fill the void left by the previous relationship.
When a relationship ends, people may go through different stages of grief and healing. Sometimes, they may distance themselves from memories of their past relationship as a coping mechanism to move forward. This can result in them seemingly forgetting about their ex, but it doesn't necessarily mean they have completely erased all memories or feelings associated with that person.
Starting a new relationship shortly after a breakup can be a way for some individuals to distract themselves from their feelings of loneliness, sadness, or heartache. They might not be emotionally ready for a deep, committed connection, but the desire for companionship and comfort motivates them to date someone new.
It's important to remember that every person and situation is unique. While some may quickly move on to new relationships for the reasons mentioned above, others might take more time to heal and process their emotions before getting involved with someone else.
If you find yourself in this situation and are concerned about your ex-boyfriend's motivations, it's essential to focus on your well-being and healing process. Everyone heals at their own pace, so try not to compare your journey to his. Allow yourself time to grieve the end of the relationship and take steps to rebuild your life in a positive and healthy way. Surround yourself with supportive friends and family, and consider seeking professional help or counseling if you find it difficult to cope with the breakup on your own.