fiance lied about money.

Kaitlyn
So my fiance and i are really toght on money since the state back dated his pension and took it out twice.  We have to skip his phone bill just so we can have money left over. 
He has seen how stressed out i am over money. 
He does a fantasy football draft every year with my cousin for money. He promised me that one would be the only one he does for money since we are broke. I checked our bank account and noticed that there was a $25 and some change withdrawn from the account to a league safe thing. Come to find out thats a fantasy football thing. I asked him about it and i could see him scramble to come up with an excuse. Hes a horrible liar. I told him he needs to tell the guy he cant donit because we cant afford it and he told me he would get the money back. He "texted" the guy and told me he said he would give it back. "" is because hes "done" things before just to get me to be quiet. 
Well im a bad fiance, and while i was sending me a video from his phone to mine, i checked the message between him and the guy because i dont believe he asked him. 
He told the guy that im "bitchin" about the money and bills and that he "might need him to him a favor if he cant bullshit  his way out of this"
His friend responded with "tell her to shut up and say BITCH go make me a sandwhich" 
And my fiance did not defend me. At all.  
Im pissed. Not only didnhe go behind my back and do something he said he wasnt but he then lied about it and then lied about getting the money back and then didnt defend me when his friend called me a bitch. 
I know it wasnt right to go through his messages but like i said, hes said hes done things before just to get me to shut up because he knows ill believe him.
He is supposed to get the money tomorrow at an event i was going to go to but suddenly im not invited to, just him, and i feel like hes goingto lie again about why he cant get the money back. We have a two year old that needs diapers and stuff and hes pissing away money on stupid shit. 
Idk what to do. Someone please help me. I already told him that if he doesnt come back with the money that im going to my moms house for anwhile because i cant trust him. But i feel like thats just not enough.