I need advice.
The answer is obvious but I don't know how to go about it.
For background, my exh and I split 5 years ago, always been fairly amicable, I have dated in this time Inc one previous LTR who lived with me and now I am living with my current DP.
Exh has come and gone living on my sofa for months at a time but currently is staying with me on the sofa of course so he can provide childcare as I work ridiculous hours in a career just taking off that I can't afford to leave, DS1 has SN and Exh is his carer.
But the creepiest sickest thing happened last night, my DP and I were upstairs dtd as it were and out of the corner of my eye I though I saw something through the glass at the top of the door.
I brushed it off as seeing things (it was getting dark) but a couple of seconds later it moved.
It was a bloody camera.
I've got up to look at what the hell was going on and there was no one there but I heard a small thud at the bottom of the stairs so I go flying down and on the sofa pretending to be asleep is my Exh and in his top jacket (yes he sleeps with it) pocket one of the old spare mobiles I keep for emergencies.
I rip the phone out of his pocket and there are 5 different videos on 3 different dates of me DTD with my DP.
I feel sick, violated even.
I tried to kick him out but he wouldn't leave as no where to go, DP is shocked and doesn't know what to do or say.
We are in the process of moving and DP was meant to be coming with us and staying in the annexe but I don't know what to do now.
Exh has alway's been a little weird, he has no family/friends, no job because of DS1 and no social life, he has battled with depression and was on meds which I found out last night he isn't on at the moment.
I am so angry, creeped out and shaky, his only offered excuse was he was curious 
I just don't know what to do, I want to throw him out and report him to the police because surely it isn't legal. It would mean the house move plans are going to go tits up as I would have to give up my career to care for DS1 and I couldn't afford the move
I'm stuck between a rock and a hard place, I keep seeing the camera in my head and feel sick.
I can't trust him in my house, I want to scream at him but it makes no difference.
My poor DP has shaky confidence anyway due to a messed up childhood and it's taken a lot of work to get him comfortable enough to really enjoy DTD... this is going to mess us up, I'm worried he is going to freak and leave me cos the EXH is a dirty peeping Tom, he is nearly 40 ffs not a nosey teenager.