Asking Forgiveness After Falling into Sin - Feeling Broken

Wa Alaikum As-Salam. I’m a man in my late 20s. Today I met someone and slipped into a sin I had promised myself I’d never return to. It’s been weighing on me all day. I’ve had a past with a lot of sins, but about a year and a half ago I worked on my iman and felt much prouder and happier. I even performed Umrah a few months ago, and now I feel like I repaid that with this mistake. Today I fell back into that sin, especially worrying because I’d noticed my iman weakening over the last few weeks. I’ve been getting down seeing people I know, some younger and married, and feeling low in faith. I’m angry at myself and disgusted - like I deserve no good in this life. I prayed two rak‘ahs asking for forgiveness, said the dua for tawbah, and have been saying Astaghfirullah all day, but I still feel empty, like my soul has gone. I keep thinking I deserve nothing good, and maybe that’s why I’m still unmarried - like I don’t deserve happiness or a spouse. I just wanted to share and ask for advice or reminders. Any dua, words of encouragement, or practical tips to rebuild my iman and move forward would mean a lot. Please pray for me.