8 mos pregnant and marriage is over

Tonight at 8 mos pregnant I believe now my marriage is over. My husband and I have been fighting for a few days. I've been feeling somewhat insecure. Feeling that he hasn't been telling me things. He says he forgets. Then last night after a fight he comes home later than when he sad he would be home without a text or call. Tonight I get a text saying he would be late because I made such a stnk about him not texting or calling last night. Now tonight come to find out a female worker that he used to work with came back yesterday. My it's my gut or maybe I'm insecure right now. We had a huge fight and he left saying if I don't trust him it's over. I'm am shocked and in disbelief that if he cares about me so much he would be able to just walk away so easily. I guess I expected more a different reponse not that he was done with our marriage. Makes me feel like I wasn't wrong with my fears.