<human>: Hey Reddit,

I'm a piece of shit. Now that that is out of the way tell me what to do. 

I've only dated my girlfriend and we've ended up dating our entire youth (10 years). I've never done anything else with another woman but I've always wondered. 

The relationship has had many rough patches where I've thought about ending it but it's always been worked. 

I've lost much of my physical attraction to my GF due to a significant weight gain (60-70lbs). I know that's terrible but it is what it is. During her weight gain I've been working out and I've lost about 20lbs. This has caused a higher self-esteem for myself and significantly increased interest from other females. I've tried getting my GF to work out with me but she's had little to no success sticking to any lifestyle changes. 

My GF and I are in the process of building a house and have committed a significant down payment to this project. Our house is still a few months away but it was a big step in our relationship. 

The problem:
I met a girl (online) on Reddit and we have clicked like crazy. What started off as fairly harmless has progressed quite quickly and we are now at the point of FaceTiming and texting often. I haven't physically cheated on my girlfriend but emotionally I seem to have checked out. 

If I pursue this long term relationship I may stay unhappy and always wonder what could have been. The perks are I'll be with a person I'd consider a great friend and partner but there'd be little to no sexual interest. We'd have a nice house and a perfectly quaint life. 

If we break up and I go after other women, I lose a relationship we've spent 10 years building. I'll lose money on the house situation and I'll be single for the first time in what seems like forever. 

I don't know what to do. Any advice is appreciated and I understand I'm a lowlife. Thank you.

Give me a shortened version of the text
<bot>: I have been in a dry relationship for a few years, met someone, afraid to throw away 10 year relationship for a possibly better situation.  Stay with the known or risk it all?