Unreasonable behaviour?

[nostaples]

Would DH pursuing a colleague at work (evidence online and he admitted to physical contact but not sex on a works night out followed by meeting her at least once afterwards) count as unreasonable behaviour whilst still living at home followed by joining an internet dating site (while still at home) and dating multiple women (after leaving)? I have evidence for some of this, although I see no reason for him to deny it. Would I need any other grounds or would this be sufficient? TIA.

That's plenty, and you don't need to provide any evidence. The oft-cited example of unreasonable behaviour if you want to keep things civil is your ex not putting the lid back on the toothpaste, so you're fine with what you have. It sounds crappy, sorry you're going through this.

Thanks @AnneLovesGilbert feels pretty crappy today I have to say.