Why was she wanting to kiss him she obviously knows about you, or doesn't he tell her about you?
Maybe he told her you are on the rocks and she wants him and he let her think he is about to be free? Talk to her, her number is on the texts, see what she says, or ask him not to see her and see how he reacts.
IDK what he did or didn't do, he will lie to you if he ****ed her anyhow. She might tell ya the truth.
Life is a song - sing it. Life is a game - play it. Life is a challenge - meet it. Life is a dream - realize it. Life is a sacrifice - offer it. Life is love - enjoy it.