This can happened and the game full of random results ... you can't always win and this lose shouldn't make you so sad .

work on your team to make him better about the moral raise the moral again and don't play any important mach with health lower than 75% or 80% would be better.

your team morale must be full off ... and replace any player who don't play well and make him play only one half ...

finally losing one or two matches doesn't mean you will keep losing but this a time and you will win again