The chances of a guy forgetting about his ex-girlfriend and falling in love with someone else depend on various factors, including the guy's personality, emotional resilience, and the circumstances of the breakup.
People have different ways of coping with breakups, and some may take longer to move on from past relationships than others. Some may find it easier to open their hearts to new love, while others might need more time to heal and process their emotions.
Falling in love with someone new who reciprocates feelings can happen, and it's not uncommon for people to find love again after a breakup. When both parties share mutual affection, it can create a strong emotional bond that might resemble or even surpass the intensity of previous relationships.
It's important to remember that every individual and relationship is unique, and there's no one-size-fits-all answer to this question. The healing process and the ability to form new romantic connections can vary greatly from person to person.