Im sad that lexa died so here is an alternative ending-
Lexa faked her death to escape with clarke but culdnt tell her and was going to get her the night she 'died' but clarke left so lexa searched all over for her and ended up finding an abandoned bunker that was still sealed but was kind of small. she entered it and stayed inside with a young child she found inside for a while the childs mom had died a while back when she was a baby and lexa found her when she was still a baby and raised her to age 5 when lexa felt it was safe to get out and let the kid who she named madi outside while Lexa got some fresh food for them because they had been eating canned food for a while. so madi got taken in by clarke and lexa looked for madi but coulnt find her and at one point she finds madi again and madi shows her to clarke after hearing stories of lexa for a while and then they live together until the others return and get the rest of the people out of the bunker. but hers the thing. she gets stuck in cryosleep because they cant open it and when sheidheda manages to open it they battle and lexa escapes and runs and ends of living in the forest until after the final war thing and clarke comes back and finds lexa there again and they live happily ever after and the entire show ends with them kissing.
and yes i know this has so many plotholes but Clexa is the best ship and should have been a reality for longer. and yes im going to refine this and make an entire plotholeless alternative ending thing about this. thanks for reading!