I read every single response in this thread and how much everyone is loved by their guinea pig. Love is not anything to delve into so not even thinking to that as it's a feeling and personal, even to animals. I have a farm of animals. Chihuahuas, cats and my guinea pigs. We've had birds and rabbits in the past but not in many decades. My chihuahua is my love and is always faithful. In my time of migraines, she has literally loved and saved my life. She is a chihuahua and that's how she shows her affection and love. My son's cat is a unique creature that is beautiful, sweet in the moments she wants and wants nothing to do with us about 20 hours from a 24 hour day. When she does, it's for us to open a door for her and serve her. But she shows affection and when she felt fear from a storm we were in, she showed it and turned to us. She's a cat, it's how she showed it to us.
Our first guinea pig was literally a bribe to my daughter for a friend in a new place. My 17 year old daughter. I was ignorant and knew nothing about guinea pigs other then I had heard they were 'easy pets'. Pfft. Ok. We all truly fell in love ourselves with our first guinea pig. She is very different from the rest of our babies. She was a rescue and known to have not come from a great place. Was 8 months old and the most stubborn creature I've ever met. I truly love this little baby. I get visits from her and call her my grandbaby :-). But more, I watched her become beloved to my daughter and is extremely close with her. She is a little monster. She absolutely cannot bond with another sow as she is so aggressive. My husband says she is spoiled, in a very affectionate way :-). She has the run of my daughter's room and a cage she can go in an out of for her kitchen. She will purr, sing ALOT, scream for attention and follow you around until she gets it, loves being picked up and held and is able to outsmart us all when she puts her mind to it. She is really best friends with our 2 lb chihuahua Bella and you can't tell the difference-we even call her our little puppy at times. It's how each of these little ones show their feelings and affection is part of it. But with all these little ones that make my life so full of joy and my days so happy, I give them all my love. I think that's why I have them and the most important part. All our guinea pigs give me just as much joy and affection in the happiness they show simply for being part of our life here and our family. There is for certain a difference in this from before we brought them home from my recollections and from the ones we got a few of them from.
I think if you give them a chance, yours can answer that question with quite a lot of certainty. They are really gifts.