Welcome to the forum and I'm sorry for your loss.
Yes it would be a good idea to get another. Teddy still has many years ahead of him - too many to spend alone. Its good he is doing ok for now. It gives you time to look into finding a new friend.
It would be best to get in contact with rescue centres and enquire about dating. The rescue can help you find a suitable character compatible friend for him which will result in a compatible bond.
If a rescue centre isnt an option or he becomes too distressed from being alone and needs a new friend asap, then buying another piggy and carrying out a bonding yourself comes next. Do be aware though that buying a new piggy on spec does come with risks. One being that the two piggies won't be compatible and a bonding may not work. Its always a good idea to have a back up living arrangements plan in place if you are to try an on spec bonding in case of failure.
Looking After a Bereaved Guinea Pig
A Comprehensive Guide to Guinea Pig Boars
Bonding and Interaction: Illustrated social behaviours and bonding dynamics
Rescue Locator