Espalier apple

I put this espalier apple in about seven years ago. I've never had an apple from it. This year the only blossom on it is that tiny splotch on the right - so, no fruit again this year. I'm fairly such something much off all the budding tips in March - leaving bare branches. I'm glad at least it has some leaves. It's west facing - all afternoon sun. I'm wondering if I should give up and put something in that's happier and hardier. I have to water it every week, still, in the summer, because it's in an odd spot, and seems to need it.
I also have no blossom at all on two crab apple trees I put in three years ago. I'm sad about that. I was so looking forward. 😕

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I came on to post an update photo in my old thread on it when I saw your post!
Which is what I wanted anyway!
The James Grieve ( 8 yrs) had no fruit last year but is covered in blossom right now. The other two are dwarf cordons about 5 yrs old, east facing, fairly shaded, have had a few blossoms but no fruit. Loads of bees around to pollinate and the pear seems fine.
There seems no rhyme or reason to apples!