When your friends are dating each other, it's generally a positive and happy situation. To acknowledge and express your support for their relationship, you can say something along the lines of:
- Congratulations! I'm so happy for both of you. You make a great couple.
- It's wonderful to see you both together. Wishing you lots of happiness in your relationship.
- You guys are adorable together. I'm thrilled for you!
- Seeing your smiles when you're together says it all. Best wishes to the new couple!
- I'm excited to see this relationship blossom. You guys are perfect for each other.
- Here's to a beautiful journey ahead as a couple. Cheers!
- Love is in the air! I'm so glad you found each other.
Remember to keep your tone genuine and heartfelt, and try to express your happiness and support for their relationship. If you're close friends with both of them, they will likely appreciate your warm wishes and encouragement. Additionally, be ready to be there for them if they ever need a listening ear or support during their dating journey.