Simba and Kula have been friends since prior to the beginning of the series. When Simba was having anxiety and nightmares about Scar torturing him again in captivity she was the first one to see Simba cry about it, and comforted him. Simba and Kula kissed twice, once in "Into the jungle" and again in "love overdose". They were never in a real Relationship, but got closer as the seasons go by.
Start up: Love overdose