Help with UK visa from Oman

We are hoping my boyfriend can travel from Oman to the UK on a standard visitor visa. It'd be for around 2 weeks, his father would be financing it, he is studying in Oman but is originally from Egypt. I was hoping I could receive some advice as I've been reading here about visa refusals. Of course we don't want to lie and not mention that he is visiting his girlfriend, but how can he convince immigration that his intent is not to stay here? I read that him being in education should help, but is there any other documentation or evidence he can provide as proof? Also, regarding finances, would 6 months of bank statements be enough proof of funds or would he need to get translated payslips/proof of employment (hoping to avoid this as it would take a while).

If there's any other advice you have on how to get a visa accepted, or links to useful information, we would be very grateful. We're quite young so not used to such serious and intense documents, and I really don't want to mess up! Thank you.