Here’s a revised version of your message:
"Ntando, it really hurt me when you distanced yourself. Your actions suggest that you and Sihle are convincing yourselves of something that isn't true. If you were truly my friends, I believe you wouldn't treat me this way. I’m struggling to understand your choices, and I don’t think this situation is sustainable. I don’t want to come off as controlling, but I can see that you’re happy with them. I just don’t know how to move forward from here."