Saying the L word

La
I've been dating my guy for 4 months and he's the only person I've been into a relationship with. I feel strongly for him and I know he feels the same.. When would be a good time to say "I love you"? 
When did you ladies/your partner say it and what was the situation you were in? x 
--Edit--
UPDATE: 3AM - he couldn't sleep and I'm sleepy after just waking up to steal the blanket of him, he whispered in my ear "Love you, but you already knew that." Aww my heart! 24/3/16 ❤️