You're right. He's lying about his age. But he's not younger than he says, as you think. He's actually older. Much older. He's 32. He's an ephebophile. He's going to rape you, burglarize your bedroom, kiss you goodbye, then give your phone number to other men. He will escape prosecution.
Press your father. Do not assume he's poor. He's actually well-known, well respected, highly compensated. Demand that he invest resources in your future, and make him introduce you to more opportunities. You know he owes you. What you don't realize is he can provide these things. Also, if you don't listen to me about the other thing, tell your father what happened. Let him help you. Giving your father opportunities to be your Daddy is good for both of you. Don't be stiff and withholding with him. He doesn't know what to do with that. It reminds him of your grandmother. He doesn't know that's just how you are with strangers in the family.
Your passport is expired when that London trip is proposed. Use the expediter. The government will deliver a day late and you'll lose time on your trip.
He's your soulmate, but don't marry him. That's not his purpose in your life. If you do marry him, don't even try befriending his mother. It's not worth it. She never comes around. She breaks your heart repeatedly.
Speaking of mothers, yours is right. All the time. A lot of her opinions are rooted in bias, so that's not what I'm talking about. But regarding anything she says you ought to do, just do it.
When he comes back during your next relationship and asks you to marry him, accept. The one you're committed to is never going to stop cheating on you. He's broken. This one is ready now, and you can be besties and lovers again. If you say no, the sweet thing he says next? It means goodbye. You will lose that friendship forever. He can't just be friends. Or he won't. Either is the same, for you. You will never stop searching for him in other men. None of them measure up.
Leave the widower alone. He's wrong. He's not ready. When you leave him, the pain will be unreal, because when you go, you leave your new family. He's not ready when he comes crawling back either. You'll never miss anyone like you'll miss his son and daughter. The pain will be unfathomable.
Do not reject Chef Jennifer's ridiculously good offer. She's right. Do not go to Boston and get married. Like I said earlier, he is your soulmate, but he can never really be your husband. Stay in NY. Also, buy the house next door to Grandma. It's a fixer upper, but you can make it work. You don't need more distance from home than that, at that time.
You live a life of saying yes a lot. You're going to see a lot of opportunities as a result. You're going to get into trouble too. Worth it.