AITA for giving my bIL the wrong phone number?

So my (29F) husband (29M) and I were out with his brother (31M). My BIL has a hard time getting dates, so my husband and I are trying to help him out. This is the third time we've gone out in a group setting, and the second time the same thing has happened. There are usually several women around, so it's not like he has no options. We usually just go for food and meet at the restaurant. This time we all met at our house, and ride shared to the restaurant. <br><br>I was talking with some other people while we waited for our table, and I noticed a young woman (early 20s?) working as a hostess. She looked bored, so I went and talked to her. She was really nice, and I thought she looked familiar. I asked her if she went to our local college, and she said yes. I then asked what her major was, and she told me. I actually took a class in the same subject over the summer, and she's in the class this fall. We chatted a little bit about the teacher and the classwork. Apparently, there's a group project, and her teacher assigned groups, and she doesn't know the other people in her group that well, and was a bit stressed about the whole thing. <br><br>Anyway, I give her my number, and we exchanged texts later that day (I recognized her name from the class list). When I told my husband, he was not happy. He asked why I gave my number to someone who is probably half my age (yes, I'm aware there's an age gap, we met young). He then asked if I gave her the "wrong" number (our old landline). I told him no, and he said I should have. I feel like that's a little childish, and AITA?