I'm so sorry to hear you're going through this. Like the other posters have said this is awful behavior that is unlikely to change. Especially if he has secret accounts and lied to you about them. Also, even if he's not physically cheating on you with these women, there's other kinds of cheating and if he's talking about that kind of stuff with them I'd say it still enters that territory. At the very least he's disrespecting a boundary you very clearly set and that is not okay. The truth of the matter is, based on what you've said, he can't be trusted. He lied to you. Trust is very hard to get back once it is broken. As for whether you should give him another chance: is he doing anything to try to prove to you that you should trust him again? Particularly actions over words?
isolation_stars wrote:
I don't know if I should give him another chance or break up with him or how to go about it, which is further complicated by the fact that in a few days I'm going on holiday with him, and I started doubting if I even want to go anymore.
This definitely further complicates things. What kind of holiday do you have planned? Is it an expensive one far away? Would you be able to dump him and take a friend or family member instead? Are the tickets/accommodations in his name or yours?