We've been separated five years and divorced for three years. My ex-husband had a high paying job at an investment bank in the City, I gave up my career to travel and live round the world with his. The terms of our divorce settlement just three years ago were that he paid child maintenance for our three young children til they finish education and spousal maintenance for me for life (my ex agreed to this without any discussion or argument at all and a Judge signed it off). This past year my ex has managed to orchestrate such that he now pays just 36% of what he agreed in our settlement. So our income has been cut by £2400. He moved out of London to the Shires be with his new wife and her three children. Up until now, because he paid a good level of maintenance and I have not worked we have taken it in turns to pickup/ drop off the children at each other's houses during holidays (term time his mum or new wife collects the children from school on a Friday and drops back Mondays). So I have made the three hour round trip in our car. About six times a year each. Now I have no car because it failed to pass its MOT and I can't afford to fix it or run it. I can't afford the train fare to do the drop off to his house, this August it would have been £120 alone. I have said I'm really sorry but I can't pay £60+ to get the children there and me back to London each time. The children's fares are £6 total, it's mine that's the problem at £45+. I genuinely can't afford it but I also now feel that me taking the kids was a perk of the reasonable maintenance (he kept more than half his salary for himself with no dependents). He has no mortgage and his wife earns £80k. I have offered to take the children to St Pancras where his wife commutes into at any time she says and to pay the £6 for their fares (she said why should she pay and I agree. She's offered money before when the cuts impacted the kids after school clubs but I declined because it's not fair she should pay, it's their dad's responsibility not hers, she has three children of her own). But now even after I got over the money barrier and said I'd pay £6 she's saying she won't meet me, it's my responsibility to get them to Bedford. AIBU not to share the journeys now? I can't afford it so basically it would take money from food, he moved away and I'm desperately looking for a job and so will at some point be working. I'm a single mum on my own, no partner, with three young kids - 9, 11 and 13. What do other people do? AIBU?