Looking for some advice! I'm a 22-year-old female and he's a 23-year-old male.

I've been with my partner for almost a year now, just a few days shy of that milestone. We connected on Tinder, met in person quickly, and hit it off immediately. Since then, we've hardly been apart. A few weeks into our relationship, he revealed that he had just ended a five-year relationship with his ex two weeks before we met. In August, I discovered I was pregnant and initially considered having an abortion since we had only been together for seven months and lived 100 miles apart. However, he pleaded with me to keep the baby and assured me he would support both me and the child. So, I let him move in with me, as he had been sofa surfing. Once I reached about 20 weeks pregnant, he started acting differently. He became distant, and our intimate life dwindled. Every evening after work, he would come home and immediately FaceTime his mom, often playing games with her late into the night, which disrupted my sleep. We argue over trivial matters and can never resolve our issues, which just gets ignored until the next week when the same problems resurface. I've bought everything for the baby myself, while he claims he doesn't have the money and expresses confusion, as his single mother provided for him during his childhood. This week, things took a turn. He had a good month at work and received a sizable paycheck. I thought he might help with the baby’s needs, but instead, he announced he would be leaving on Monday to visit his mom, 150 miles away, spending almost £300 on fuel. He didn't even mention this plan to me beforehand, which struck me as odd; had he discussed it, I wouldn’t have minded rearranging my schedule. He’s also not offered to buy anything for the baby again this month. On top of that, the car he's taking is the one we share—I cover half of all expenses like petrol, insurance, and taxes—so now I’m left without transportation to my hospital appointments next week. He didn’t even remember my appointment on Monday, which I will have to attend alone, a recurring situation, and the staff had expressed concerns about the baby’s size. I'm terrified at the thought of becoming a single mom at 22 and heartbroken that he seems indifferent towards me and our baby. I genuinely believed he was the love of my life, and I was looking forward to this new chapter together. However, I don’t want my child to feel second best, like I do now. I reached out to his mom to share my feelings, but she essentially labeled me as selfish, insisting that he deserves time away with her since she misses him. She also indicated that our relationship moved too quickly, which I agree with, but he’s the one who insisted on keeping the baby. I could really use some advice, as I feel so lost and scared right now. 😫