Co-parenting: just got my first job offer post-graduation, sons mom hates it and feels like I am abandoning her.

A little background: our son is 2 and a little bit, I moved out in February. I came out about a substance abuse problem in September which ended our relationship. I have been sober since September.I got offered a great job with awesome benefits and opportunities for growth this week and have accepted the offer, Mom works a usual 8-5ish job Monday through Friday. The first 90 days of my job I will be 8-5 but after training I will move to 12-9 Monday through Friday. We wanted to do split custody but since I'll work evenings eventually there will be no weekday time I can do that until a night or days position becomes available (which does happen, but could be some time).I really believe this job is the best long term decision I can make, and am willing to sacrifice sleep and social life, which I already do, to make things easier on my son's mother and will be over every morning to get him to daycare and spend time with him before the work day.She is saying things along the lines of trying to take me to court for more money, I already pay 600 more a month supporting them than the courts calculator would have me pay even at no visitation or medical help, or that I don't care to be there for our sons formative years, and that she won't have time to do art, date, see friends, and that this will impact her ability to work.We have friends and family that are already offering help and I have told her I will work to get a more conducive shift as soon as I can, but that I have to take this job for my own personal development. I have had to walk away from two discussions in the past three days because I refuse to argue with her in front of our son.This is really hard, I want her to be happy, I really hoped one day that if I worked hard and improved myself and showed compassion and love (in the healthiest way possible given that she is not interested at this time) that maybe I would have a chance to show her that I've changed and that we could work things out. I am filled with so much remorse for the mistakes I've made and for lacking the maturity to cope with the stressors of life in healthy ways.Am I being selfish for taking this job? Can our relationship, whether it be just co-parenting or beyond ever be stable? I feel so lost and so confused. via /r/Parenting https://ift.tt/2k8Lc2t