Not taking sides here but just looking at it maybe from Dylans view. Lucy fell pregnant shortly after they met.. he moved in with her then. Who knows when he first met her he might not have wanted a long term relationship. He has had a lot to deal with and overcome in the last year also. The sad loss of Lola, the dog attack, moving, Lucy impulsiveness.
There's a financial aspect to this as well. He was paying all of the bills and everything for a good while, while Lucy was unemployed being a "stay at home girlfriend" and a wannabe full time artist.. That was only up until a few months ago, when Lucy started working at the studio. I'm sure she's been making some bit of a contribution now that she's working a bit, but Dylan's been the only one with a stable income all throughout their relationship. Although he agreed to it to some capacity, it was a ton of pressure really for a then 25 year old to try to provide for two adults, a dog, and with a baby on the way. Then all of the complications with the pregnancy happened and the loss of Lola. And afterwards still continuing to pay for everything for months, while Lucy had her dreams of being an artist. And even with Dylan working, they were still openly struggling to make ends meet.. Like for example they had to cut off their internet and had to borrow wifi from the restaurant next door.
Lucy owed money too, like the 3.5k to the Spanish government.. I'd be curious to know if he helped her with paying it off.
I'm not taking sides either, but I just think it's an awful lot of pressure to be put on one person. Especially with all of the unfortunate events they experienced in such a short space of time, and in a relatively new relationship too. I feel for both of them, they've been through a lot.