I know what too did but I don't want to

So I've dated this guy for over a year and broke up with him a month ago and he and i still talk all the time all the time literally. We still say I love you and I miss you and everything look that like we used to but lately everyone has been telling me I need to love myself before I let someone else love me bc they're only going to love me as much as I love myself. I don't love myself bc my first ex tore my self esteem down to nothing so needless to say I strongly dislike myself. I really feel I love this guy that I broke up with a month ago but my best friend and my family has been saying to focus on me for a while and if we're meant to be then it'll happen