"Just friends"

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Do u 2 people that were in a relationship can stay "just friends".If the relationship kinda ended on bad terms?Because I have this friend who was with this girl they were b/g friend at the time.She broke up with him cause he couldn't decide over her and another girl.So she broke-up with him and he got with this other girl and she got pregnant.And the ex. and the guy where still talking every now and then and he still cares for the ex. but he doesn't want to be her friend and that all she wants to be to him and he expressed the fact that they shouldn't be friends cause he wouldn't feel comfortable tell her he problems as he would he other friends.But the girl still persist to try to get them to be friends ever though he knows she has alot of ex's as friends he expressed he doesn't want to be one of those guys.....Is he wrong for telling her to KICK ROCKS!!!!!!!!!!