Overthinking

Hello ,, idk how to start but basically I have been facing alot of problems which is developing into many issues, for start ,, my year started with the girl I was dating , sleeping in front of me with another guy, not her mistake here , we weren't in a relationship but still left a mental scar on me for the rest of the year ,, I had difficulties trusting women in general after this incident, I'm sorry if I'm sounding wrong or offensive to anyone ,, i slowky found myself drifting away from people in general although I live , spend time with my friends it's always I'm feeling lonely now , I started working on me , my body , transformation began , i locked in, that when I started talking to a random girl online ,, i was not looking for any relationship but just someone to talk regardless of gender ,, i spent 3 months, alone all by myself, just doing gym, barely meeting any frnds in 10-15days ,, while talked with this girl almost regularly ,,, i did well in gym, significant process, she became.part of it,, later after 6-7 months i kind of started getting attracted to her ,, her personality, we both ,, later in soan of 2.months developed hard feelings and was abt to confess but one days she comes telling me how she's in relationship with her crush of 2 yrs now and she's happy, ,, i broke down, but i knew i could not carry this with me , so I too told her everything and confessed,, tho she asked me to.remain friends and not to.fade away or stop talking her now , and i too value our frndship mor.etham my feelings,, this all happened on 1st dec ,, fast forward today ,, i believe I moved on from her , but whenever she texts me or I text her ,, one thought come sin my mind constantly, is " you have a bf now go talk to him,, not me "" because I'm getting flashbacks of what i used to feel for her,, this is hurting me , keeps me awake thinking what's going on , idk why it's bothering me so much ,, im having worse year of my life since January 2025 ,, that sleeping incident, one of my close frnd/sister leaving me breaking frndship,, difficulties in my career, family problems , and now this right at the end ,,, idk what I'll do I was feeling to end this all right at the new years eve but I won't , I wanna heal and improve ,, I have fell into overthinking and loneliness, idk what to do