Friend got an abortion

My friend got a abortion today . I have been supportive through out her whole process because she is in the same situation I was in 4 years ago and mine put me In a really bad place and it took me years to get out of . I have been helping her watch her son and making sure she is okay , but I left her house a couple hours ago because I started getting that horrib feeling I haven’t got in a very long time. I felt horrible when I left because I felt selfish but I knew if I broke down it would make the situation worse . I talk to my therapist and it didn’t really help, the only person who helped me get through it was my ex / bd now . I’m scared to call him crying but I really need him . Right now I’m just feeling like a horrible friend and just a mess right now . I really don’t want it to seem like I’m making this about myself . How can I be a better friend , and should I call my ex ?