I need some advice ladies ?

So me and my fiancé have lived together for a year and we have been together for a year long story short I had already had a 4 bedroom house with my 2 own kids and he has one of his own! He moved in with us!! Recently my kids went out of town for a 2 week vacation and all we seem to do is fight? What is the problem we haven't had sex (maybe because I'm on my period) but still we are sexual while on? I can't help but think somethings up! He's constantly throwing things in my face like oh this is your house those are your things oh are you shure u want me here when you get home? I don't know what's going on but for the past week he's been that way! Like I said he has his own kid but I can't help to think he likes it better when mine are gone? Do you all think he's getting involved with another female or am I just crazy! Like last night I was about to tell him whatever and he screamed at me to shut the fuck up ?? Like wth ? I kicked him out of our room and he ignored me through the night but I found him in our bed this morning? Please help!??
I need some answers