I'm sorry, but that mother was straight simping for that man. Girl, don't downplay the dumb shit he did in his life because of "love." He cheated around and left your family in a shitty situation. Full stop. You can still love him, but don't pretend shit wasn't hard because of him.
Love makes you a fool, and the whole message "I loved giving love rather than receiving it" is nice when the same sentiment is returned. Other than that, you're just pouring yourself in a fruitless venture. That whole mush mouth statement "You'll understand when you get older" is such a cop out. Jesus, I hate when manga do this.