have you tried all the dating apps, LiteraryType?
I have heard that Guardian Soulmates is abysmal. I know lovely people who have become very disheartened by the paucity (both numbers and standard) of men on offer and had some horrible encounters through it.
I agree with the poster who suggests the Freedom Programme, or any process which raises your self esteem, resilience, and ability to set and preserve good boundaries.
In my experience, all dating sites have many terrible men, married men, players and liars. All of them. there is no "naice" brand of dating site which delivers only princes among men.
Going to one, like tinder, with a lot of traffic increases the absolute numbers of men you will encounter, so although the percentage of decent ones is always low, you're more likely to hit on one. I get a little bit cross when newbies are advised to go to things like Soulmates because the paucity of men there can damage your self esteem twice - firstly by being so few, and so lukewarm; secondly by being, on the whole, actually just as shit and sleazy as men generally are on all the sites.
If you let it, the process will damage your self esteem. Terrible men (terrible in all sorts of ways - not just sleazy, but also weak, pathetic, passive aggressive, etc) who aren't worth 5 minutes of your time will engage with you in ways that will make you think, if you weaken, "is this what I am worth?" the answer has to be a resounding NO and you have to be prepared to keep answering this question to yourself with NO. I strongly recommend the dating thread on here to help with that.
I met my boyfriend on tinder. he's lovely. Before I met him, I wasn't looking for a boyfriend and met a lot of guys for FWB type things. Once I weeded out the stupid, the dishonest, the disrespectful, etc, there were good friendly sexy honest interesting decent men on there.