Boyfriend cheated on me with sister nanny?

-My boyfriend of over a year just cheated on me with his little sisters nanny, he said he feels bad and that I didnt deserve that. We had been talking about moving in together and potentially having a baby in the next year or so and all this happened two days before I found him at a night club hooking up with the nanny. Two days later he texted me saying "IDK what to do I feel bad" and i responded with "Idk what you want me to tell you besides that i'm hurt and that I didn't deserve that. And i'm trying to understand why but i cant. As hard as I try to find and excuse to justify what you did i simply cant find one" so I told him I wanted us to talk about what had happened and now we are meeting this evening and IDK what to do, or say but what i do know is I dont want to lose him. I love him and I know i have ****** up in the past too so I cant be hypocritical especially when i slept with his brother. So IDk how to go about this or what to say to him but I dont want to lose him. HELP LADIES. and please dont say I'm degrading myself by forgiving him but we have gone through alot that i'm not willing to give up the fight that easy with this nanny.Um let's see- he cheated on you, he's CLEARLY not ready for marriage, NO WAY ready for a baby and his response to cheating on you is "i dont know what to say i feel bad"???? what a ******* idiot, sorry to say. move on. this guy is a total loser. immature, player, loves games, stupid, pathetic and a waste of time.
once a cheater always a cheater
Since you cheated on him with his brother, you should understand exactly HOW he feels, WHY he did it, etc. So I say "tit for tat"...and you both deserve each other.
He is not ready for marriage. Just have fun w/him, use him for sex, while you look for a more mature man.
You know what you want. If you dont want to loose him then work it out and dont. Best of Luck