Help!

my babby daddy wont sign my sons passport paper so we can leave the sate “we are in mexico” . I need him to sign so my son can be able to get his u.s passaporte and he just wont! I went to his house and he never opened the door on us! So i left the paper under the door and he hasnt even gave them back or said anything i told him cousin to tell him not to rip them or throw them away. And all he said is he’d tell him. And its been 2 days and he hasnt gave them back. Scense the baby was born he hasnt been wanting to sign because he says he didnt want us to leave. “We were still together. Now we arnt he said i can start a new life but yet he still isnt signing so i can leave! I went to the embassy and they required his signature so i have no option. Im stressed idk what to do. I cant go he wont open he said he wasnt going to open because he didnt want any problems’ like now what do i do!!! Why is he doing this im confused! Also he blocked me !