Thoughts?

[M0ff1]

My phone had ran out of battery, I wanted to fact check something related to what we were watching. I did this on his phone, showed him the results. He requested phone back, proceeded to close everything that was open. I asked him why he'd done that...said he was going to bed, didn't want it all open and running. I said I wasn't finished fact checking, why did he close all open apps at exact moment I had his phone...? I've had a partner unfaithful to me in the past and he can't see my point of view but say my behaviour is 'psycho' for wondering what he closed them at that moment?! I asked for his phone again, he refused 'on principle'. He also said if I don't trust him then to end the relationship. What would you think?

You're not 'psycho', and he's likely been communicating with someone else.
Get rid.

Sorry OP. You feel uncomfortable and that is understandable. Rather than reassuring you, he is being defensive. It’s horrible to be let down by someone you love.

His reaction would make me very suspicious

Had had something open that he didn't want you to see.

What that was is anyone's guess but it was probably something you wouldn't have wanted him to be looking at and he knows that.

When he said if you don't trust him leave it sounds like that's probably what he wants and you'd give him an easy way out. Anyone who cared would reassure you.

He was definitely hiding something. Then he called you a psycho and told you that you should break up with him. He doesn't sound like a keeper to me!

Any man who uses the term 'psycho' to describe a woman whether that woman is his partner or an ex, is covered in red flag bunting imo.

If he had nothing to hide, he wouldn't have acted like he did.

No apology this morning. I am inclined to agree with if he didn't have any thing to hide then it shouldn't be a problem. But he's saying that if I even ask then it means I don't trust him, and he'd not hand over his phone as 'doesn't feel he should have to'. He says he has nothing to hide and it's toxic and offensive of me to suggest otherwise.

It could have been a molehill. Now it’s a bloody big mountain that you’re going to be in the shadow of until something changes to let you trust him . Being told you’re psycho and toxic makes that mountain so much bigger.
If I were him - and there had actually been something to hide - I’d have deleted it all by now. So you’ll never know. But unless you’ve got other reasons to doubt him, maybe he’s just sensitive about his privacy - and lacking empathy and understanding about issues that are going to make you feel vulnerable. I’d probably feel most worried about the blaming and refusal to apologise or explain, best case (!) is it speaks of emotional immaturity and lack of compassion.
I had a friend who once walked on a man because she’d come across him having huge anger management issues with someone else. She took the view that if he had that nastiness in him, she didn’t want that around her. Has your guy also just shown the tip of something unpleasant under the surface?