My GF just “cheated” on me

we’ve been together 10 months and live together. it moved fast, we both said we were exclusive after 1 week and she stayed at my place over half the time since that first week. we said we loved eachother and got together around 5 weeks in, tho we both said we rly felt it before that, around week 2/3 which is fast ik but it rly was intense, alot of loving eye contact, all that stuff and by that point she slept at my place literally 80% of the time or more.

since then, its been slightly rocky but definitely good overall and a very loved up affectionate relationship with talks about the future etc.

well today i found out that she slept with someone that she said she didnt andddd it was 3.5 weeks ish into us seeing eachother… wayy after we were exclusive.

there are extra details that make it even worse, but thats the jist. shes been literally on her knees begging me to stay with her and that shes sorry. are the quotation marks on the “cheated” even necessary? bcoz yes technically we werent officially together yet but we did agree to be exclusive atleast 2 weeks before and apparently she already loves me by that point but still slept with someone else? or am i being stupid bcoz it was so long ago and we werent officially together?

lowkey turned into a rant but its 5am and i need opinions

UPDATE: Apologies for the lack of replies, been having her pack her stuff. I did struggle following through and its 10am with 0 sleep but I kicked her out. petty little add on as i was dropping her stuff at her grandparents i let her grandad know this is because she cheated. even after that shes still messaging me saying shes sorry and she loves me. so fucked.

UPDATE: Honestly I already feel alot better. Getting literally 0h sleep that first night and not eating rly fucked w my head and made it feel so much worse. Still up and down ofc but i rly appreciate everyone being so supportive and giving advices. Ive never rly ran to reddit for advice before mid breakdown lol. Gunna have a closure chat w her once she pulls herself together. She wanted to do it today but shes still not slept, throws up all food and got sent home from work today for having a mental breakdown. so closure chat gotta wait. also ik ppl gunna think its weird for a closure chat but bcoz it all happened so suddenly it feels right. plus i did one with my ex and i think it rly helped me move on, so hoping it helps this time too. probably do it in a couple days so will drop another update for anyone interested.

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