Ha ha!
(Laughs in a nasty and cruel manner, points unkindly)
Sorry to say it, mate, but exactly how long did you expect that Halfords Special cut-and-shut job to last? Now, were you to actually get a decent bike (such as a Rock lobster 853, f’rinstance), then you would be able to enter the world of having a bike that isn’t sh1t.
And to be honest, coupled with your mechanical ineptitude, I’d say biking isn’t for you, really. Probably best you just give up, and take up Bingo or something, instead. More your intellectual level. Plus, you can’t fall off, playing Bingo.
Sorry, but it had to be said. I’m sure everyone else agrees with me. Even your wife does.