Difficult ex won't sign papers

Hi so I'm trying to get a divorce but my ex will not cummincate with me. It took 6 months to get an address for when I file for divorce. It is not there address they refuse to give me an address it's there freinds.

I'm very hesitant on starting the divorce because I'm scared I'm going to hit a brick wall when they don't sign and be out of pocket.

We have no children property or money involved. I am not Useing a solicitor because I can not afford one it has took me 3 years to save the £550 fee while working full time and supporting myself. My ex also refuses to pay towards the divorce.

I was going to divorce on grounds of 2 years seperation but I have been reading that is not the best route to go especially if your ex is difficult and will not communicate. When ever I message them on WhatsApp I get ignored or a thumbs up emoji it is very frustrating and I just want this over with.

So basically what I want is help with examples of unreasonable behaviour.

My ex was not physically abusive or anything like that but they did cheat but hard to prove and not another route I want to go down.

Also I want to know what happens if they do not sign the papers for unreasonable behaviour or deny they even received them. All I have is the address they gave me which they do not live at and a possible work place but that is it.

I searched the electrol roll but they didn't show up.

Sorry for the long message but I just want this nightmare over with. I have attached a cropped image of example of what I get when ever I message them.

Thankyou for reading.