need an outsiders opinion

my husband and i have been together for almost 10 years now. we have two kids with another due soon. things have always been pretty good. weve had our ups and downs but nothing to bad. recently ive been finding things online that he has been doing. creating fake profiles on sites to talk to girls to get nudes. ive asked him about it and he always says he doesnt use it anymore, i watch and hes telling the truth. but then i find he has a new account. about two weeks ago i found out that one of the girls he talked to on his fake account, hes now talking to himself. she has posted online publicly that she has a crush on him (back in october). I asked him about her and he said it was someone he used to talk to but doesnt anymore and that she still trys to contact him because she is crazy. so i let it go. and not even a week later i find out he is still talking to her. I talked to her myself and she told me they talk all the time and that he has told her that h e doesnt love me anymore. i obviously got upset and got mad at him.
he then started saying to me that he can't take this anymore. hes tired of me always accusing him of stuff he doesnt do. he said there was no hope for us anymore, he wasnt happy. we fought for a few days. then things settled down. he started coming up to bed with me. talking like everything is ok. making plans for the summer. but still says everything isnt fine. he doesnt want to talk about any of it. i have no idea what is going on or what hes thinking. he hasnt left, he still kisses me, tells me he loves me. but i cant get what he said out of my head. i have no idea what to think.
any opinion would help.

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