Looks like your opponent made two pair on the river.
You have to consider the board when playing. You have 55 and your hand is essentially counterfeited when two larger pairs are on the board.
Essentially, you both have JJ and TT. This means who wins the pot will come down to the "kicker". He has a K, you have a 6 (since this beats your highest holding in your hand and you're playing the board).. Your 55 is valueless on that river.
If you need further explanation, feel free to PM me!
you need to make the best hand using only 5 cards. Since you have "three pairs", you can only use the top two pairs and your opponent unfortunately has a higher kicker than your 5 kicker.
you need to make the best hand using only 5 cards. Since you have "three pairs", you can only use the top two pairs and your opponent unfortunately has a higher kicker than your 5 kicker.