I am getting suspicious of my husband.... really long plz read.

Wanted to start by saying that my husband used to be so loving and sweet and he still can be but he has changed.... a lot. It really started around 2/3 weeks ago I think. It's like someone flipped a switch. All of a sudden he was being snappy at me over everything. I just dismissed it as something that was happening because of our financial trouble and the fact that we are expecting (I'm 15 weeks) his first child which is kinda scary. I tried to make it better I took time one day went and bought groceries that he would really like. I made him a steak dinner and made the house super clean so he would be happy. He didn't even say thank you. Oh well I let it go. Fast forward a few days and he has stopped kissing me good bye in the morning. He will just holler love you from the front door. This is someone who used to make sure I woke up from his kisses. He would kiss me all over my face until I woke up so he could say he loved me. So I got worried. I have tried to talk to him about this and he flips on me saying that he isn't gonna be accused of anything. It's kinda weird to me because we used to be able to just sit and talk about anything. Story goes on. Meanwhile while all of this is unfolding another thing weird has been happening. He usually leaves his phone on the bed side table when he uses the bathroom (he has a morning ritual and evening one too lol). Not lately. He has been taking his phone with him every time. The other day his phone lit up when I was in the bedroom alone. We have never had an issue with checking each others phones before. I look to see who it is to see he has a shit ton of msgs on fb Msger. I open it up. He hasn't checked his msgs in a while, which isn't abnormal for him. But there is one thing out of the ordinary. There's this girl. I'm gonna side step right here and explain something. My husband hardly ever gets on Facebook. He has friend request from the yin yang. Okay so back to the story this girl. They are now friends on Facebook. Me obviously knowing my husband this peaks suspicion as to why my husband is being so weird. So I don't freak out I look at her FB then close everything out and walk away. A couple hours later after we watch a movie I casually ask who this lady is. He starts talking about she was around when they would go to vape comps and stuff. Then he said her and her husband. This girls profile said single. I stopped him dead in his tracks and said "this girl is single not married". He quickly comes back with yeah they just got divorced. I just say "oh okay. I just seen her add on fb and was wandering." Well this of course started WW3. Either way. Two days later here I am and I am waking up because I smell his coffee machine. I was hoping to catch him before he left so we could make plans for after he got off work. I pick up my phone to check the time and I only have one notification that says *my husband* has added Marco Polo. Ladies for those of you who do not know Marco Polo is a video text app. This is completely strange for him! I have the app for one of my girl friends who was also ttc and she prefers that over texting. I call him and say I wanted to catch you before you left but I woke up and you had just gone I seen you added Marco Polo. He says yes my dad asked me to add it. 😑😑 your dad!? The man is 70 and can barely make a text. Sigh I let it go though and continued the convo. He asked if I wanted to go with him after work to help a buddy real quick and I told him sure I will just come to the shop and let him fix my tire then I'll ride with him. Well that stops him dead in his tracks. He is all like I can't think right now I'll let you know when I get to the shop. 😑😑😑 dafuq!? You just asked me!? Whatever I get off the phone. And i really start to worry because I remember that same said lady from before works right up the street. I'm really worried. I don't want to jump to conclusions or anything but he isn't helping me be assured that I am wrong either. What would you do?