Is it sexist to not want a wishy washy partner?

As a young woman I watched my mum conflicted with every single decision she made.
Whereas my dad even if his choices were selfish he stood by them. If he needed to correct something that didn't work in his favour he looked to seek out a solution.
Yes he leaned on my mum and yes he made "networked" to make those decisions a bit easier but he always tried to move forward.

When I listened to the stories of my grandparents meeting my grandfather was very much the kind of man that stood by his word.
He said he would marry my grandmother after meeting her at 15.
When they fell pregnant he said he would do all he could to provide and look after her.
So much so when he came to the UK without her he said he would work enough to be able to send for her and find work for her too.
1 year later she was here, 4 years later they were married and buying their home that they still live in until this day.

When I started dating and met men that didn't seem to honour their words or stick to a decision. I found it really difficult, to stick with them and eventually we'd break up.
I don't think I was the most demanding person.

But I also didn't understand why if you decided something today to carry out the following day do you now just give up on it before it's even started.

I'm sure some will say it's because it was the wrong person but I feel that's just them. Indecisive...

I try not to be this way so maybe my expectations of a partner are high.

What is your take on this?