If you stop paying into your savings plan, you are not going to achieve the savings value that you were aiming for – and will have less money in future as a result. Try to avoid stopping payments into your savings plan – it’s there for a reason, it does the job well, if you stick to the plan.
Apart from that, all the other terms and conditions of the savings plan stay the same – as long as you’ve already completed the initial period of your savings plan, the amount you have already saved will stay invested and growing until the end of your chosen duration, it will still have some value in future, just not as much it would have if you stick to the plan.
When starting your savings plan, pick an amount that you can afford to stick to, and prioritise that monthly amount in the same way as you would with other expenses, such as somewhere to live and something to eat. In future, the financial circumstances – and therefore the lifestyle – of Future You is entirely dependent on the financial decisions and plans you make before that point in time comes. Create an awesome financial plan, and stick to it!