Hey /b/ros...I am faced with an ultimatum at this time. I was

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Hey /b/ros...I am faced with an ultimatum at this time. I was wondering if you could help me out.

Background
>Mad men is one of my favorite shows
>I liked how the men acted, like men and not this pussy SJW shit
>*insert cliche "I hate my generation" meme here*
>I subconsciously created an alter ego of Don Draper, I even used the same name from time to time
>I have been dating my gf for 5 years and I can tell she wants to get serious
>I have a job that pays well enough for us to get married and be stable
>new girl (let's call her Alyssa) comes into work, cute, shy, and mysterious
>one of those girls you know are going to be crazy in bed
>I walk over and introduce myself as Don and I invite her to go to lunch with me
>she accepts
>take her out, I order a whiskey neat, she sticks with soda
>I tell her to order a drink and it's on me
>I cut the chatter short after lunch and I get real close in on her and start kissing her neck
>I swear I could hear the dripping from her panties
>go to shitty motel near work
>bang it out
>she collects herself and we go back to work
>openly drinking in my office, bourbon usually
>start slicking back my hair and staying well shaven
>boss notices new behavior and welcomes it
>brings me a case of cigars for my office
>I start to feel like a real man
>new girl and I always go out to lunch and fuck
>sometimes if I feel like it I put on the Don machismo towards the other ladies after work

this has been going on for 1 year now

>goddamn I feel like a real man
>it hits me like a freight train
>holy shit I've been cheating on my girlfriend for the past year with at least 10 other women
>I've been even leaving in the night to see Alyssa
>I've been fooling around so much my dick doesn't have the potential for my gf at the end of the day
>Girlfriend gives me the choice: marry her and get her pregnant or I lose her forever

What should I do /b/? I do love her but this lifestyle of banging other girls makes me feel so powerful.