In the manga, Bakugo and Kirishima don't get together romantically. They have a strong friendship based on mutual respect and shared experiences in battles and training.
Often, they portray him as frustrated. Without his quirk, he loses a big part of what makes him feel superior, so he's likely to be angry at the situation and those who look down on him.
In some fanfictions, Bakugo can become more empathetic. For example, if he experiences a situation where he realizes the pain he's caused Deku over the years. His aggressive nature might soften as he starts to understand Deku better. Deku, on the other hand, could become more assertive. Instead of always being the timid one, he might stand up to Bakugo more firmly in fanfiction scenarios.