How do I let him in?

K
Hello ladies,
I've been a single mother since my son was 6 months old.... He turns 6 years old next month. I've had relationships here and there, but nothing seemed to stick. I've been talking to this guy for a while now. He knows I do EVERYTHING by myself. I work full time, go to school full time, and handle all of my sons responsibilities too - as any other mom does. However, this afternoon this guy and I were talking, and all I wanted to do was vent. It was about my taxes and how I had recently received an email stating that the IRS is holding tax returns for people who filed an Earned Income Credit and a Child Tax Credit (which I qualified for both). It said I wouldn't be getting my refund until the week of Feb. 27th... I go on to explain to him that I get my refund every year before my sons birthday (which is Feb. 10th...and I always use my refund to throw my son a birthday party..but I can still do it without the money)..Like...all I wanted to do was whine for a minute. That's all. But he followed that with "Do you need me to send you money? Because I will send you money. I'm going to send you a card so if you ever need me, I can send you some." LIKE NO I DONT WANT YOUR MONEY. I CAN MAKE MY OWN.😠😣😐
He's a good chunk of years older than me and makes very good money... I get that he wants to help out, in which ever way he can, but I'm not over here looking for a sugar daddy🙄 ...Is it just me? I'm so confused because I feel like any other woman would have gladly taken the money regardless if she needed it or not. I just haven't been able to "have it" that way, for a very long time. It's always just been me and my son. 
I don't know how to let someone into my life, when I've done everything on my own so far. School, bills, doctor appointments, nightmares, trips to the park.... Does anyone have any advice on how to let someone into your life, and open up to them? Or am I trippin' for no reason? 😕
💕Much Love