Hello! Not sure if this is the place for me

I have been single for 2 years now, I believe by choice a I'm not actively looking for a relationship and the thought of being with another person and starting a relationship again doesn’t interest me in the slightest. I became single at 28 after spending 11 years with the person I thought I was going to marry and have children with. He worked and lived abroad for 6 years of the relationship, said he was doing it for us (incredibly well paid and tax free). In the time he was away he’d come home regularly and for the first 4 years I’d visit him regularly, anyway to cut a very long story short he was living a double life with another woman. I’d been living in his house for almost 2 years after his Mum passed away and we’d put it up for sale and had put an offer on the house of our dreams, He told me he was coming home, it was in the first lockdown and after months of being “stuck” abroad I found out he wasn’t were he said he was at all , he was in fact in the usual place and living with this woman. The manipulation and torment that came after it was horrendous, a little insight, everything I did on the Internet or watched on TV he knew about as he could access it abroad and there’s was CCTV in the house. It was a long drawn out process but when he caught wind of me putting stuff in place to buy my own house it got nasty, he’d send stuff to the house addressed to me for his new house (knowing I had nothing but my clothes, I’d given up furniture to move out of my parents home to his Mums which was fully furnished), he would write and send letters to the printer telling me about the future we could have and how much he loved me but did this so it couldn’t be traced back to him and shared with the other woman (she knew about me) and eventually gave me 2 weeks notice essentially leaving me homeless as the new buyers were moving into the house and he’d be returning to move into his new home that he’d bought for us both, didn’t tell me the details just turned up in the doorstep 3 days before I was due to leave and asked for a hug. For some context he’d spent years telling me he was going to propose, sending me videos of the ring he was having made and on one holiday telling me to get my nails done, not to look in his case and to dress up nice - at the end of the holiday when I asked him why he’d said all these things he told me that I ruined the holiday when I asked if he was moving home permanently, he said he was and yet he hadn’t returned any of his stuff which I then questioned.
It’s taken a long time for me to recover and I’ve done a whole U-Turn on what I want in life, I have no desire to get married or have children. I’m now approaching 2 years living alone, turned 30 this year and have been single since, I look back and recognise a lot of negatives from the relationship and wish I’d listened to the people around me. Despite all this I’m at a point where my closest friends have got married and are now having babies and part of me feels a little bit sad about being stuck and not moving forward or I guess having nice things to celebrate. I’m in a good career and we’ll paid although because of the cost of living tend to live month to month and I’m so sick of listening to the above mentioned friends say “you just need to meet someone” because that’ll solve all my problems.
Eurgh for those interested my ex is now engaged to the other woman, which left me feeling for a long time “what is wrong with me” and has left me questioning myself a lot.
Anyway, there are many day I love being on my own, more days than not for sure.
Thank you! I feel like you’ve hit the nail on the head for me… “we’re unworthy when we’re not in relationships” - I have friends that will inadvertently isolate me from conversation because I’m single, not married and without kids.