Relationship

So… i love a boy… but in the last 2 weeks and even today…
He’s causing so much pain in me…
And i’m standing here knowing i have to make a choice…
A girl, is sleeping in his apartment, she’s the type of girl that dates a different guy every month…
I really don’t like her
I want to trust that he will not cheat on me…
But i simply can’t do it, this is killing me everyday…
When i thought everything was going to get better…
It got a lot worst instead…
I’m so frustrated with all that…
I’m trying to be sober and all that shit…
I simply can’t deal with this right now…
I need to choose between
Leaving him, ’cause it hurts a lot to be close…
Or stay with him, ’cause i think that maybe i’m commiting an horrible mistake and i’m going to regret it later…
I don’t know what to do…
I’m having trouble sleeping…
He used to help me with my problems (when he wasn’t the cause of it)
It’s like i’m torturing myself with all this, i’m thinking too much about it.
Tommorow i will talk with him about all this…
I’m really afraid that i commit a mistake, if i do, that will really hurt a lot for quite some time.