I made my friend cry

I (19, female) went over to my friend’s (23, male) house and he showed me his new puppy. It was adorable and I immediately fell in love with it. I was so excited, but he had this somber demeanor about him when i was petting the dog. He told me that he and his long-term girlfriend had recently broken up and he got the dog because he thought that she was going to get pregnant and he wanted to get familiar with having something to take care of, and if things went south (which they did) he would already know how to take care of the dog. I was pretty surprised because i had just met her a few times and, yeah, that’s that. He said he was going to be lonely after she made arrangements to move out and that having the dog made him feel, as he said, “a little better”. I was really excited for him and told him that he would be a great dad one day (I was just being nice and saying what I thought he wanted to hear, however, I can see why it was offensive, now, in hindsight). He just looked at me for a second, and i could see a dark cloud pass over his face, and the next thing I knew, he was sobbing. Like, really sobbing. I apologized and tried to make him feel better, and he told me that him and his ex had always talked about kids, and how he's not sure if it'll happen for him. Ever. He just kept repeating, "I might never get to be a father," over and over again. he eventually told me that if i wanted to leave that that would be fine, so i did because he obviously wanted to be alone. I just don't understand why he reacted the way he did and I'm genuinely concerned about him and wanted to know if anyone here has any insight into his reaction.<br><br>Edit: I am not the one who got rejected. I was just in support of him and made a mistake by saying he’d be a good dad one day. I don’t actually think he’s a good man and I no longer wish to pursue a relationship with him.