This issue happened 3 times w diff girls so i cant ignore it. am i supposed to not build the confidence of a low self esteem girl?

(u can dont need to read the context n just give me ur opinions or advice)

For context, i(M) do get laid in dirtyr4r related subs since the girls there r open minded n straight forward,

but I'm trying to befriend girls on clean subreddits with the intention of just friendship that lasts or w the possibility of becoming fwb. i didnt straight up hunt for low self esteem girls but they may be like that from clean subreddits. since im not looking for a rs, i just find friendships n hookups seperately(it blurs sometimes). once i built the confidence of a girl, she finds some guy n wont bother about the friendship anymore so its like a waste of time for me. so what should i be doing instead? not build her confidence? but i am too molded by the media growing up to help