Is there life after true love?

I met the man of my dreams.. I love him with all my heart. he is my whole world... my life... but he does not feel the same anymore... He wants to leave and go back home. we were planning on getting married and having a small family ( just three of us and the dogs) and he quit drinking and he was totally commited to our plans... and now he gets drunk stays up all night talking to his friends about how HE wants to go back home... he wants to go back alone... We bought a truck together (or so I thought) because his car died. I am the first signer on it.but after we got it he is all bragging to girls how it is HIS and started talking to this female friend that I do not like ALOT. I dont like her because she does not aknowledge my existance.(which makes me think she has a thing for him & vise-versa. I dont want to lose him... but I do not want to force him to stay if he is miserable. I told him it is either me or getting drunk because we fight bad when he is stupid drunk. what should I do?