u/Connect-Bid2447

so my ex cheated on me with his stepmom and we divorced and they ACTUALLY gave him our cat sir teddy thomas the seventh
sir teddy is the best thing that ever happened to me and i miss him dearly
my life has turned into a nightmare without his constant meows
last night i finally had enough and i planned on taking back what's mine and that my dear friends would be sir teddy thomas the seventh
so i made my way to my exes apartment and obviously i found his spare key beneath the mattress
then i executed my plan and got sir teddy back and being honest i went a lil rogue and had to use the bathroom
in the bathroom i noticed our destroyed wedding pictures and then i took a dump in his sink, i just left it there with no remorse
but now my ex is nonstop calling me and asking for sir teddy and what happened to his sink
AITA for taking back what's mine and gifting him the equivalent of our relationship

at first i have to preface this by explainibg that me and my highschool sweetheart - let's call him mike - have broken up 2 years ago and i am facing something truly horrendous...
let me explain it to you
my ex cheated on me with his stepmom and she's around my age, his dad found out because i told him and he filed for divorce
throughout our relationship i always was close with his family especially his older brother - let's say he's called luke...
last week working at their family restaurant, his dad's actually my boss at work and the situation hasn't been awkward at all since my ex is in finishing his master's degree in acting/ art history right now
as of late i started hanging out with luke more since luke broke up with his long term gf and he's felt really sad and i consoled him. one thing led to another and we started a romantic entanglement and se actually got engaged a month ago
he got me the prettiest diamond ring and everything was working out perfectly
then his dad entered my equation and i have to say that there has always been a tension between us - even while dating mike...
i have to honest right now and it's really messing me up but i've been hanging out with his dad on the down low and we've had great chemistry in bed
of course i was sure that this affair couldn't turn into anything serious since i am engaged to his son but i just had to jump his bones.
sadly i've started missing my period and i didn't think anything of it but it's been three weeks and i got myself to buy a pregnancy test - as of now i am pregnant with my ex boyfriend's dad and my current fiancé's dad
my best friend told me that this isn't right and that i should seek out therapy but i am living by the motto gaslight girlboss gatekeep
AITA? and how should i go on?