Break up

okay so i’ve dated my ex for 3 years he said he lost feelings so we broke up i told him I’m willing to be friends and he said he is too and is going to try to gain feelings ! i seen him walking with a girl after class and he walked her to her dorm and gave her a hug & after I confronted him he said she’s just a friend and that doesn’t mean anything (he’s not the type to go fucking any girl in other words he is not a hoe) should i be concerned or ignore it