I would definitely have a conversation around my difficulties in trusting people, that it takes a lot for me to trust people like i trust him, and how it makes me feel when people lie, that i handle the truth much better than finding out i have been lied to no matter what the reasons are. having this conversation should encourage him to be truthful to you in future and if he is not then he will be aware through your reaction to him that you know he has lied to you.

me personally once i have let a person know my feelings around being lied to, if they lie again i cut all ties to them immediately, if they insist on a reason why, i tell them straight because you lied to me. lying is an instant dismissal on my carers contracts. there is no excuse for lying.