Fucked my neighbor behind gfs back and i regret every second:/

So im in a loving relatioship of 2 years with my GF , i do love her , but we have had bedroom troubles in the past , her hormones mainly , and her adderall perscription tends to dry things up down there. But we have for the most part worked thru it , but this period is super stressful for us i cause we are buying a home and nothing is going right , this process has been going on for a year and a half , and we have both let ourselves go a little bit , well she has stopped being actice outside of going out on the weekends at ita showing , i like to be fit and sexy so i try to take care of my body and i end up catching more attention for it , to which she gets jealous... anyways i have always had a impluse problem and being horny all the time does not help , for some reason recently ive been non stop thinking about anyone but my gf ... males , females ,trans so i was out walking one early morning about 2am and saw my neighbor in a skimpy lil dress so i couldnt help but hit on her , which she liked and then we hugged to say goodbye , like a big hug , which immediatley gave me a reaction to which she pressed against harder...she is a attractive smaller redhead but does seem like shes a little strung out and has a picking problem , wellll i looked right past all that when i texted her after to see if she wanted to smoke ... she replied instant yes , which i knew was a dtf reply , so we end up doing it , do it for like 4 mins then immediatley the regret sets in:/ shes not that pretty, i used protection but what about scabs n shit , it was super akward and i felt like a just needed to go home and shower an make sure my gf doesnt catch me , we hug then i say like an idiot , gotta go cause i dont my gf to think im fucking the neighbor to which i was usher out the door being told ya you need to leave rn then :/

What. The. Fuck. Is wrong with me.

I washed as soon as i pulled out at hers , went home and brushed and washed and hoped that she was being honest about no stds.

This is the 6th time this has happened , 4 with randos , 2 with close to my friend circle and gf.

My neighbor knows my gf and her friends. I am an idiot.