Tough decisions..😰

Tamia • 💕😌
This is going to be quite long but I’ll try to shorten it up the best i can. Please don’t judge me or say anything hurtful. I’m just honestly a very confused and stressed 19 year old. So it starts with a guy who’ve i meet 3 years ago Justin who was the love of my life, my best friend, my rock, and who is also a marine and has been one since the day we made it official.  We’ve dated the last two years and ended our relationship around thanksgiving because Justin was insecure about himself and thought he wasn’t good enough for me and so on. So we went our separate ways and he partied or whatever he wanted to do while i tried moving on and getting him out of my head. In January i started talking to a guy i knew from this contrustion class(which i don’t take. I took a emr class in the same career highschool) he was a college student who is 21 and a very sweet guy. Things kinda went fast and i know it was because i was hurt from my past relationship with Justin and honestly me and Alex hit off. It was differnt to have somebody to talk to when whever there was time because i felt like comparing the two, i clicked more with Justin. About a few weeks ago. Justin hits me up asking how I’m doing and you know getting the update on my life and etc and i did the same for him..expect i didn’t tell Justin about Alex and i honestly being in a relationship.. Justin apologized and said he would do better in anything he can..i replied saying that he’s going to have to work on getting me back and so far he has. He went to trial( becaus he flipped his car one time while visiting his family down here in Georgia) and received a new car and started going to classes to help improve his driving abilities. Justin popped the big question about marriage and I’m not sure what to do. I’m going to college which i don’t even know how I’m going to pay for it but i know that if i get married to justin i will receive a like half of the tuition i would already pay. now before i almost fully lives down to North Carolina where Justin is stationed but i didn’t when i started taking my college classes while going to my original highschool. I’m honestly stuck on what to do because my heart is town between a guy who I’ve loved for two years and to a college guy who might not even have a successful relationship in the end.. i do plan on going to a college for anouther semester probably since i already have 12 credits and transfer to a college in North Carolina and problby get married but i just lost. Can somebody please give me advice (the top is Alex and the second is Justin and i on our first Christmas in 2016)