Feeling the weight of the world on my shoulders

Assalamu alaikum, everyone. It's been really heavy on my heart lately, just watching how our Ummah is struggling. Sometimes it feels like we're constantly losing ground against our own nafs and Shaytan, you know? From the whispers that distract us to the bigger issues like conflicts and trust being broken between people... it's a lot. On a personal note, I was talking to a sister about marriage recently. Things seemed positive at first, but then she suddenly moved on. Turned out, a brother I considered a friend-who Alhamdulillah has a better job than me-ended up marrying her. What really hurts is finding out he went out of his way to look into my private conversations online to make it happen, even though I never shared anything about her. It feels like every time I try to connect with someone, something goes wrong. I know I shouldn't let it get me down this much, wallahi it's just taking a toll on my iman and mental peace. How can someone who calls themselves a Muslim act like this? Seriously... how?