Kitty,
I don't know where you are in CA but I was just doing the math. I would estimate that he'll need closer to $10K USD for a month of hotels, cars and gas (or Ubers), two or three meals a day for himself or both of you, entertainment, travel insurance, etc. That sounds really high but that's about $300USD per day. I have family in CA and I've been there many times so I know the costs. I stay with friends and family. My brother goes and stays at hotels with his fiancée and even low-average hotels are about $200 a night.
We are all just worried he will arrive, tell you he's broke, and ask to stay at your house. Don't let that happen.
I see a huge red flag. Even if he's a good person this type of relationship will be cost-prohibitive (too expensive).
He should come for a week instead of postponing the trip. That would be much cheaper.
Meet him and let him leave. Then decide on your next steps.
PS
If I overestimated on the cost that's fine. He needs to have "extra" money, instead of counting every penny and being worried about how to eat every day. He should have that safety net.
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I never give you my number, I only give you my situation.
Beatles