I feel like if the girl broke up with him, he'd still have feelings for her and the hurt and messiness that follows that will only hinder your relationship. Who wants to be with someone who still likes and is pining over someone else?
And the time frame I'd say it would still affect him would be like, 5 months maybe?
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While what you say makes sense, I think you will learn many people have been dumped and still have someone they think about. I dated a girl for three years and lived with her for a year of that, I am certainly over it and hardly ever think of her, but I still think back sometimes/ wonder about her. Few people truly tuck away past relationships, they are a part of who we are now, exes form who we are in relationships now.
Now if he is truly pining over someone else, or not over it as in thinking about her all the time, still sad- then he should take time to sort it out before dating someone. Basically- it depends, and you can't use time as the sole indicator here.1