I can see where you are coming from. I still love and care for my ex, we were together for a long time. If he needed me I would help, however if he had a gf, I would feel that my moments of care, would no longer be required.
I have been ill recently and I've asked if he could help me out a bit with our dd, he's happy to help. He also asked how I was feeling, because again her cares about me. However for 'emotional' support I don't go to him, I have an OH for that. I also wouldn't dream of having a key for his house!
I also don't call him for chats. Tbh I may speak on the phone once a month at that. Our contact us via brief text.
You do need to sort boundaries as you could ruin both your new relationships. I'm also sorry to say that I believe she is taking you for a mug on some levels. Next time she asks for something, question whether it should be someone else's responsibility.
Also you said you still love her like you did when you met, I wanted to say that I still love my dds, from all that we shared and that we had a dd togther, but the love is a romantic love, I don't fancy him, I just have this strong caring feeling for him. If it helps, I once thought this was romantic love and when we were both single we tried again, it didn't work. I thought it would as we co parent so well, but it never worked because so
Much time had passed and the love was like a family love - I couldn't bear to sleep with him as it felt like shagging a brother!