Oh, I'm sure he loves you too, Daisy, and that he really wants marriage and children and rainbows and unicorns.
But he also wants a fantasy life with naughty girls and threesomes and cuckolding fantasies. Which isn't wrong or right, it's just him. What is wrong is that he is clearly doing more than you know about, and he is prepared to lie to you and minimise your concerns time after time.
He is definitely doing more than you know about, from what you've said.
He noticed you were 'off' but didn't know why. So what does he do? He sends you a bizarre text about how you'd obviously 'fallen into a trail' but then refuses to talk more about this. There is no possible explanation for that except arse-covering. Let's pretend there's a real 'trail' here. There are two possible sorts of trap. The first takes the form of him creating an imaginary set of suspicious behaviours, to see if you'll pick him up on them, like sending himself filthy emails or texts to see if you'll read them. If he was doing that, he would a) be a really sick individual, but also b) set them up to look like they came from another woman, not you AND IMPORTANTLY c) wouldn't have disclosed that it was a trap until you'd confronted him. Which you didn't. The second option is that he set something up which alerts him to the fact that you're reading his texts/emails/internet history - read receipts, keyloggers, etc. In which case a) still a sick individual, b) it could be done with completely innocent texts/emails, no need for them to come from you or be filth, AND IMPORTANTLY c) would have confronted you about the 'snooping' before he noticed your behaviour was off - because he would already have known.
Neither of those things happened. He knew something was up but not what, told you about this 'trail' and has repeatedly refused to tell you what that is, or why. And is still refusing.
Added to which - he told you the texts were a 'gift' to you. So they can't have been 'the trail'. So what is 'the trail', and if it doesn't exist, why did he feel the need to claim it did?
Added to which again - he's now promising to 'only do things with you there' - so is he admitting that the texts were not for you, then? Or is he admitting to other activities? Is he admitting to having lied about any of this yet, because until he does, there's nothing. The above is just not, and cannot be, logically coherent unless he's covering something up.
I'm so sorry you're in this position, OP. I hope you find a way out of it. You sound like an incredible woman.