She’s back in his life 😪

I’m so lost right now. I’ve been working so hard on our marriage. A little back story, my husband left me back in June for someone he met through his work. We needed up getting back together about a month and a half later with the understanding that she was out of his life. For good. Because it hurt. Well this morning I saw her in his messages. I haven’t talked to him and I decided I’m going to wait to see if he tells me he talked to her but my heart aches. We have two kids under 3 and I have been doing everything I can to change on my end and I’ve seen change on his end but he’s now showing signs of setback. One day he wants to throw in the towel and the next he wants to have another baby and buy a house. I’m not ready or even know if I want another baby and we are not in the financial situation to buy a house. I don’t want to overthink it but I also do not want to bring it up. I want to continue to see the change and I feel him telling me there was a conversation that that shows change. I don’t know I’m just not sure I’m happy anymore because I can’t trust him. Any advice would be wonderful.

This is the conversation.