GAH, it hurt so much seeing Will’s heartbreak, both in the past and present day when he had his heart.
I agree that the kiss was an “I forgive you.”
As to whether he’ll try anything now…well they did have that little conversation about changing the laws of magic and what Ana had wanted to do with it, (I like that she wanted to go all the way back to changing them ever going to WL in the first place, as opposed to just wanting to make Will love her again), so I can see Will being tempted to try something magical to be able to bring her back.