OP having a dog is a huge commitment and like you I got one when I was part of a couple and had a job that he could come with me each day. Then we broke up and I had to change job. Other half who always professed to be huge animal lover said to put him in dog home! No way could I have considered that as I loved him to bits by this time.
I had a huge panic at how I was going to manage but luckily my parents give me some £££ and I bought a place outright. I got a part-time job which still meant too many hours on his own but I walked him before work, then straight after, then again in the evening. I also spent nearly all my free time with him throwing his ball, playing with his toys, hiding treats, giving cuddles etc. It was pretty exhausting to be honest and I used to feel like a single parent.
Hobbies stopped, dating stopped. I only visited people where I could take the dog. Luckily I am a huge introvert and so lack of social life didn't bother me too much and I was always out and about with dog anyway.
We're 12 years down the track now and I have spent a fortune on him. I mean thousands and thousands. Insurance covered two cruciate surgeries when he was two (thank you petplan) but as he got older I stopped with the insurance (don't do this!) and had to fork out £3K in 2024 when he started having huge problems with his stomach and was losing a ton of weight. Actually it was more than 3K - that was just to see the specialists and then there was steroids, regular blood tests, visits to vets each week, b12 shots etc. Probably cost me nearer 5-6k in the end.
Owning him has been a life changing experience. I have utterly adored him and spoilt him rotten (like really, really spoiled him!). It absolutely did change the direction of my life though and I do sometimes wonder where I would have been if I had not got him.
Like you I tried doggy daycare for a while when I was working but apart from the cost and hassle of having to drive him there each day I got hacked off with the woman who used to get ratty if he barked. Eh, you are looking after dogs...surely that comes with the territory.
Eventually when he was about 5 I got work that I could take him with me again although it was a very stressful job which I think impacted him too.
Old and retired now (well fifties, so sort of old) and so we are together all day long now. My food bill is huge ever since I got him and he very early on discovered steak, lamb, venison etc and so getting him to eat dog food became almost impossible. My own fault I know.
I also bought him the best dog beds money could buy which with hindsight are good but probably weren't necessary as he sleeps on the couch or my bed. Still one good bed is probably a good idea but I bought him like 4 of them.
Only you can decide what to do with yours but I just wanted to say that you are not imaging it. Having a dog and doing it properly is time consuming, very tying and will hugely limit your social life/holidays etc. It will also bring you lots of joy and happiness and love and contentment.
Will I get another dog? It's going to be so tricky when he goes. The house will feel so empty without him but at the same time the thought of saving on groomers, vets and the huge food bills is very tempting indeed. Also I would quite like to stay home some days in my pj's and just have a duvet day. This is all impossible with a dog (ok not impossible I guess but I couldn't take the guilt of his sad looking wee eyes wondering why his usual schedule was being disrupted)
At least if I get another one I will know what the heck I am letting myself in for. Sadly there are lots of dogs out there barely walked, left alone all day and fed cheap dog food.
If you can look after him well the right thing is to keep him. If you can't then the right thing is to find him a home where someone else can do it. It's not easy at all to make the decision. I wish you luck.