I have a question, my brother broke up with his GF that he was seeing for a year. Within 2 weeks he already had a new GF, now he is all into her the sameway he was with his ex. How can a man go from one serious committed relationship into another committed relationship? Is this a rebound thing? Will it last? I really liked his ex GF, she is broken hearted and wonders how he could move on so quickly.