Hawks was clear -almost painfully so- when he said he didn't want commitment. That's why you never expected him to consider a full relationship with you or even care that you left. After finding out he had gone on two dates with Rumi, you decided to cut communications with him. No angry messages, no slander, nothing. Just disappeared.
In reality, you had moved out of the city, only a couple cities over into a small, rural town of 1700 people. Staying close to the forest, you kept to yourself and lived in a fairyland forest. Only after you'd moved did you realize you were pregnant, having originally assumed it to be food poisoning.
Nonetheless, you had a house to remodel and a life to live.
Hawks has, from your knowledge, moved on to date Rumi publicly. He has no idea you're carrying his child or where you lived, so it was to be expected. So, you raise your kid in secret, save for the town locals, who knew you both quite well after some point for one of your crafts and awing ability.