u/Big-Rock4242

I was unemployed for almost 1 year I then joined a very average job. After a week of training I started my job and it kinda sucks, Above my office is IBM and I think of working there every time I pass by. During my smoke break I saw one of my batchmates coming out of the IBM office and he met me, I asked him if he worked at IBM and he said that he had been working there for over one year and I got really jealous so much that I couldn’t even tell him that I was working in the small office below his floor. Now when I work at my place it really feels just sad and I cant get over the fact that even tho I had more experience than him I couldn’t have what he had and that thing just kills me.

So I 24[M] was engaged to this girl 24[F] crazy in love,1 month after our engagement I noticed she started following this random guy(all of our friends were mutual) so naturally I asked who he was and she said he’s a business partner soon things started to change she was ruder and everything like that and it wasn’t very long until she ended the relationship.My family kept asking me the reason and even I didn’t know it.
After a week or so she told it was because she wasn’t sure it keep her secure in the future because I don’t have anything planned out and this was during the time when I was starting to get into a new genre so I told her she should’ve been supportive etc.
Anyways I couldn’t forget her I tried for 2 months did drugs and every shit possible but it was just getting worse each day.
So eventually I texted her and she responded and told me she’s already with someone,I thought she’s saying that just to keep me away from her then she sent me pics in which the guy wasn’t visible but she was and I was broken to pieces but I wanted to confirm something,of course she wouldn’t tell me who it is but her best friend was a great friend of mine as well and she told me its the business partner. I was fuming I called her out for it that she cheated on me and she started playing the victim and said its not him and then she said that I was just trying to lure you away I’m with no one and these pics were fake just stay away from me.
When I asked her friend she said because I told her I wanted something to hate her so she lied to me.

Anyways bcz I still loved her I trusted them even tho I shouldn’t have and she said somethings that made me question my sanity for the next 9 months all I did was blame myself became ill did therapy had some heart conditions as well.

Fast forward to 6 months I saw her car outside some apartment at 1 in the night but because that was her business I let it go but a girl in Pakistan doing business 1 in the night seems fishy.

Then 9 months later from our break up I was just listening to songs on my Spotify the ones we both used to listen to. I went to her profile and saw that she and that guy had a jam together and everything with proper couple songs and shi and some wedding songs playlist as well.
I then tried to look into some of our mutuals spams to find him but they had unfollowed me as well,but through a friend that felt bad for me and my situation I got to know that they had been dating and talking even before the engagement.

Why, not only did she cheat on me she put me at fault and made miserable for such a long time and I have so many ways to get back at her and ruin everything but at the same time I’m not sure because I have loved her so much and I wouldn’t want to hurt her in any way at all.

Im so at the bottom and idk how to deal with this emotional betrayal.

I have got a job at up skill and signed a contract in which they have told me to give them a notice period of 90 days before leaving.
Now I got a job offer from repstack which I have been meaning to join since forever but they want me to join immediately what do I do?