If you eradicate disbelief that all your challenges are about the money or the extra responsibilities you will incur, then you will project only insecurity. It’s severely old fashioned. Without judgment, let’s shine a light on the idea that you are well equipped to satisfy all of your needs on your own, with little to no help. You can provide for your children emotionally. You stand a good chance to find a job that meets all of the needs that your children need financially. A safe and clean home, a school, some clothes, food to eat, and some money to save and meet needs beyond the basic foundational ones. It may not be easy, at first, but with technology and your ability to work with an international audience, the only thing in your way is yourself. In other words, in a world that is set up for infinite possibilities online - find a way to create the audience that will want to buy something you can create for them. Work traditionally if this is supportive and possible when necessary. (I've energetically channeled this answer for you because it's how I answer everything and I do. Hope you find it supportive.)
First you must meet your emotional needs. Get into pure alignment with your physical foundational needs, including mental and physical health for energy and vitality to see you through responsiblilties. Get on a good regimented practice to care for yourself in ways that each day you are ready to take on your world. This will enable you to meet your children’s growing emotional needs as well.
With that, the rest will take care of itself. The energy field around you provides for you in ways you have yet to encounter in your mind. It is consitently feeding you energetically, with the ideas and guidance to get you through each and every experience. Begin to listen carefully. You will get the ideas you need to take the next best step. Trust that you are fully capable.
If you don’t, your children will suffer from parents who may eventually resent each other as they stay dissatisfied without meeting their own needs. You must live a life that you’re proud of that meets your needs consistently, or you won’t be able to sustainably provide for your children emotionally, financially, and physically the way you’re living now.
From this place of understanding. Stay only if you can mend the relationship between you and your partner. Or go, knowing you will be able to live as the parent your children need.