I just need to talk, I'm too anxious

I just "need to talk" because I'm VERY VERY anxious, but it's nothing too serious. I'm going to see a guy that used to work with me, he is the SWEETEST, but he lives in another city and it's very expensive to go there. I can't afford right now and I told him that, but he's insisting (and even wants to PAY for me, the tickets and the Airbnb). I don't want him to because I hate people paying things for me, he's basically gonna pay for everything and I don't feel comfortable with that and I told him that, but he's insisting. I also can't afford to pay almost 600 for tickets, but I do wanna see him and now I'm freaking out.

The thing is (and I am VERY VERY ashamed of saying this) I'm 27yo. I still live with my mom BC in my country is VERY expensive to go living by yourself (unless you have a good job) and I don't have money right now, what am I gonna say to her (yes, I'm talking like a teenager, I'm not gonna go into that, but BC of her, I sometimes see myself as a child/teenager): mom I'm gonna hookup with a guy that works with me, bye. And I'm anxious BC I don't know what to do, but I do wanna see him. And I'm freaking out. Should I go see him and will I be selfish if I let him pay? What would you do if you were me?