<human>: So me and my SO have been together for just over a year and a 

half going on to two years. We are normally really happy and 

fit together really well. Lately though in the past 3 months I noticed 

things were changing. He started taking more care in his looks

and started socializing more which is fine with me but this also

meant he spent more time on his cellphone. I always thought it

was abit strange becasue he normally never gave his phone a 

second though but because I didn't want to seem like I was

being controlling or "psycho" i just let it go. This was until

a few nights ago I went on our laptop which we shared and saw his 

fb account was still signed in. His messages popped up and i saw 

an  exchange of messages between him and another girl who i 

thought was just his "friend." These messages were flirty and 

would go on  for days, they'd often have inside jokes, nicknames 

for each other and would tell each other about each other's day. All 

which is stuff he rarely did with me anymore. He also would jusitfy 

what she was to me before I even asked and would always bring 

her up in conversation. Which i found weird cause I as his "gf" 

never once came up in their conversation. 

Also inside his inbox I found he had messaged his ex-gf. 

What bothered me more was when asked about who he was

messaging he lied to me. I have since confronted him about it, and 

I am trying to get over it but I can't help but see those flirty

messages playing over and over in my head and I know he 

has promised to try and be a better boyfriend. How do i overcome

this guys without ruining my relationship and going crayz? Help

me please guys!

Could you distill the essence of the text into 1-3 sentences?
<bot>: I caught my boyfriend having an emotional affair and now i can't seem to get over it regardless of the fact we have talked about it and he has promised to prove to me he can do better. What do i do?