It’s a hoover, designed to get him back in your thoughts, designed to upset, anger and confuse you, anything so you stop no contact so he can get his control back. Just ignore it, they hate being ignored. And maybe use another site if it’s too triggering, I have been scared to go back on the site I met my ex boyfriend on in case he comes up on a list of ‘top matches’ or whatever they called it, it would feel humiliating and triggering and upsetting. Also, you can usually block men on these sites so you might just be able to do that so his face doesn’t keep coming up to haunt you. No doubt he’ll hate the fact that you’re on the site and can meet other men so will have done this to get back in your face again.