AIO husband searching a woman on instagram…

AIO? I was looking at instagram on my husband’s with him beside me. I seen that he searched a girl that he told me a few years ago told him she wish she could have sex with him.. (knowing he was married) I asked him who that was because her username didn’t say her full name. At first he lied about the woman name and tried to make up another name.. he couldn’t tell me her last name. So I ask again what her first name was and he finally told me truthfully her first name but wouldn’t tell me the last name.. which I said her name and he confessed that was her. I asked why would he be looking her up on instagram along with having a friend request sent..: he told me him and his buddy use to work at the same gym and they both were asking each other if they knew those girls that use to go there.. and I asked why did he send her a request and his reason was it was sent years ago. I’m am mad because I feel as though I’m being gas lighted and lied to.. also in the same conversation he told me if I don’t start having sex with him he is going to go find it somewhere else… mind you we had sex 6 days ago and I’ve been on my period for 4 days.. he tried to turn the whole situation on me and act like I’m acting crazy or I went looking on instagram so if I didnt do that I wouldn’t of seen that.. we have been married for 6 years together 9 years. Have 3 kids together.