In the comics, Yelena doesn't kill Clint. Their relationship is complex but not marked by such a violent act. There are various conflicts and resolutions, but not this one.
In a post - battle scenario, Clint Barton is injured and taken to a medical facility. There, he meets a nurse who takes special care of him. She is gentle yet firm, making sure he follows the recovery process properly. Hawkeye, used to being self - reliant, is initially a bit resistant to her help. But as days pass, he sees her kindness and her unwavering dedication. He starts to open up to her, sharing stories of his battles. She is in awe of his heroics. Their relationship blossoms as he recovers. They go on walks in the park near the facility, and he teaches her some basic self - defense moves. It's a love that grows out of mutual respect and admiration.
One key element is trust. Given Hawkeye's dangerous life as an agent, his love interest has to be someone he can trust completely. Another is understanding. His partner should understand his need to protect the world. For example, in a relationship with a fellow S.H.I.E.L.D. agent, they would both understand the demands of the job. Also, shared values play a role. If they both value justice and helping the innocent, it would strengthen their bond.
Thor could also be in the mix. His god - like powers and different cultural background compared to Yelena would create an interesting dynamic. Maybe Yelena is initially in awe of his abilities or she challenges him in some way, leading to an engaging interaction.