blackmailing

Report the case to police.

It is your or your friend's case ?

A coin has 2 sides , similarly in these types of cases by just listening to one side of the story will not help in solving the problem. There may be something else in other persons story of this .

Just by trying to take help from others don't make you a perfect person when you have false stories by your side .

If you are that much interested go to police and do everything in a legal way . 

But one thing I want to suggest you

If you are making false allegations about him 

That's enough for him to go away from you cause fake story tells him you used him not loved him for even a minute of your life 

That will be enough for a great lover .

Seeing his girlfriend lieng about him .

That proves him who you are actually.

What you hidden inside your face this many years .

And one thing if he has point or evidence that you betrayed him by cheating on him having illegal relationship with others while committed to him you'll be in trouble.

Anyway my point is there is no use in making false statements and taking sympathy by others at the end The truth wins everywhere.

The emotional damage you do to a person by cheating on him will be having far more dangerous results in his life 

If proved he went to mental issues by your actions you may get bad things coming on your way by law I hope .

Anyways go to police if you are true then take anybody s help if you are genuine 

Otherwise God will take care that's applicable for both of you .

Goodluck 🙏

I can attach files here but no need thank you.

if you do not want to go to police then you are at wrong forum.