The only real way to find out what if anything is going on is to ask him. But you seem to think he still lies, even then? If he has given you good reason to believe he lies, it will be hard for you to trust him and you may have to consider having some outside help. Do not know if you live in a place where Marriage counseling is a possibility, if it is, that could be a good step to begin. Good luck!
I can tell English is not your first language and I'm sorry people are rude here except 2 people-well, 3. Try to ask him if he is lying. Or if this will cause problems because of your culture, keep watching to see if he lies again. Then ask him about why he feels he must lie. Ask in comments if you need more help.
Sweetie it sounds like you suspect your husband is lying, and usually our instincts are right. Sit him down and talk with him. Tell him how you feel and you want the truth! That's if you really do want the truth. Or maybe you've misunderstood something. Maybe if you tell someone here what's going on we could better help.