Advice? Relationship

Hiya I’ve recently met someone, I’m in a newbie relationship.. and I have absolutely mad feelings for him. I adore him too pieces but every time I think about his children and mother of his children it makes my heart sink... 🤷‍♀️ some days I’m fine with it some days I feel torn. Im 18 with no kids whatsoever. he’s 25. So I understand he’s older he’s gonna have all this. Has anyone got any advice or similar situation. ( mother of his children is not happy of our relationship and it being very petty by messaging him dumb stuff too)