He lied to me and it may cost our marriage.. What should i do?

Hello everyone,
So my fiancé and I have been living and dating for 5 years and our relationship as been struggling for over a year. We maybe do “things” once every other month as well as just cute stuff and I just found out he has been lying to me about his school.
I graduated from university in December of 2019. Before my graduation, I confronted him about his “first degree” which was in music. Apparently he never had one. I was upset but moved past it quickly since this is what he told me when we first started dating (but did keep the lie going).Now, we both have invested seriously in the continuation of his education. He changed course from music to criminal justice since he is military.A year ago, he wasn’t doing well in some classes and I would occasionally ask him about it. When this happened, he would get very upset. So I stopped asking.Through this year of spiraling, I have applied to graduate schools and am planning on mooring to which he is very supportive of and would go with me. We had big plans for our future when he would graduate this spring and I would start grad school in the fall. He would work and build his career and I would be in the books. Both of us following our dreams...He has been slipping. He works security and gets 2 days off a week and works a half day on Friday’s. Every week, he calls out the day before he has those 2 days off and Sunday, he almost got fired because 1.) he does it a lot 2.) it was Valentines 3.) he had just had an uncomfortable talk from his boss the day prior 4.) he wasn’t sick.. he was fine. Needless to say we had a talk about it and he was very upset with me but decided to go in that day. I asked to call them first and he didn’t. So I just told them he was in his way. He then calls me from work yelling saying that I’m going to be the reason he would get fired... not sure why but I was very upset and cried most of the day. When he got home, he acted VERY happy! He was on top of the world and it was like nothing had ever happened... naturally I confronted him the following day. We talked for several hours about where the relationship was going and what we can do. Throughout these 5 years, we’ve had multiple talks like this. Somewhere trust was brought up. And he had mentioned that he was stressed about graduating. I asked him why and he said I don’t know I have A’s and B’s. (He had been saying the A’s and B’s since January.) Since he’s started his last semester, he has been playing with his friends up until at the very least 12am 4 days a week and works 10 hour shifts except on Fridays. I have over $5,000 invested in his education to which I want him to succeed and not this be all for nothing.I let it slide and I asked when did he apply for graduation. He said “I haven’t gotten anything yet”.... I know that’s bs.. we went to the same university and I graduated before him... they start applications at the beginning of the semester and constantly email you about it.. I asked him why hadn’t he looked at the graduation application. No response. I asked him to find the deadline. He was trying to stall. I found it on my phone. The deadline was going to be this FRIDAY! He showed me his email which he checks daily and of course they had been consistently emailing him about graduation.. “you weren’t going to apply or even look at the deadline. We’re you”.... no response.... I asked to see his grades. Not only was he beyond failing... but his classes end in less than one month... March.. I was told May... he has a 36 and a 66... his GPA is a 1.9 (he’s wayyy smarter than that).. and you need at least a 2.0 to graduate... he hasn’t tried this semester to get good grades... I was devastated. My parents have said that if he doesn’t graduate that they would bless our marriage. He lied... is there any coming back from this?? I need help