Am i betraying my current gf

It doesnt make sense. Re-write it

Yes that is emotional cheating.
Why are people so damn terrified of being alone and dealing with their emotions? Jesus...

If I'm reading this correctly and you're dating/engaged to your current girlfriend as a way to forget about/get over your ex, that is unfair to your current girlfriend. She deserves to be in a relationship with someone who genuinely wants to be with her rather than to be a rebound. If you are not truly in love with her, it's best not to lead her on (and I hope you aren't engaged if this is the case).

Wtf? You're a scumbag! Dating another person after you broke up with your ex? You're sick!

I don't think you are betraying her.

No you are not.

For some people its normal to still love your past loves, even for your entire lives. However, you no longer spend much time with them (if any).

I still love 3 past ladies I dated with the hope that we would marry. I has faded a bit over the decades... but it's still there.

My wife knows about this - and understands that its a natural part of my personality (it's common for a small % of the population - and is well documented in the professional literature).

While I love those 3 people to this day... 2 of them have moved on in life with other partners and I'm ancient history that I'm sure does not bother them in the least.

The 3rd one became my lifelong best friend (40+ years) and we talk routinely and see each other several times a year (and my wife has no problem with that). While a friend that I still love very much... she is no longer sexually involved with me like she was when we dated and discussed marriage.