what do you think i should do?

So, my boyfried and I have been dating for a while now and I will admit that we both have had our ups and downs. Lying and whatnot, but thats was agreed to all be in the past. Smoking was an issue last December, and was promised to me that he would quit. I caught him lying to me about it several times, and he has promised me that it wouldnt happen again. i have realized that smoking is a hard habbit to stop, so I have givien him the benefit of the doubt, but what hurts is the lying. Earlier this week, I found a pack in his jaket, and was surprised to see them in there because he said that he would make a better effort to quit. well, I found yet another pack in his jacket today, and what Im really pissed about its that he lied to me about them. i have told him over and over that smoking isnt the issue now, its that you lie to me, but he doesnt seem to get it. I noticed that some money that was left on the table was missing, and he said he took it just in case he needed it he lied again

and bought another pack. Now when i try to confront him with all this lying, he starts to bring up the past. To me it seems like he doesnt want to fess up to his wrong doings, but its getting harder to trust him now bacause of all this.....