Friends with benefits known him 18 months, friends with benefits one year? Something off?

Anonymous
Usually meet up once a month. December no meet up he was texting and compliments and flirting.
Something felt off though could not work it out. I asked direct question “was he seeing someone else” he gave vague reply and said “please don’t think that, I will see you next few days”. He was to go abroad to family he contacted to come to mine then suddenly texted after arranging that he could not stay the night he had back ache! He came round his embrace was limp, his kiss half hearted. He suggested we go upstairs then made song and dance about his back pain! He showered and went to leave straight after intimacy and he always stayed I looked him in the eye and said I wanted him to stay until 2pm, he was deep in thought then silence then agreed I was happy. He went downstairs then within minutes he changed to staying until 1pm I felt I didn’t matter. I challenged him he laughed he could not explain why time was important. He called me bad in my house! We never argued and here we was arguing over one hour! My wall went up I told him let’s go now! He suggested 15 minutes more I said no now. I believe he was texting woman and had prearranged time with her. He never ever in one year changed meet times and he had changed that too in the evening.
My question is
a) why did he come to me that night at all
b) why did he not tell me he was seeing someone else when asked
I texted him next day concerned thinking I had done something wrong, he said nothing is wrong please relax. Later I reflected and called him out on his bs I then blocked him, did I do wrong? In my mind he pre arranged meet up and had no intention of intimacy with me so why did he come !
Updates
+1 y
Sorry it should be times 1am and 2am not pm
Updates
+1 y
Thank you for all opinions, it would be great to hear girls take on this too
Friends with benefits known him 18 months, friends with benefits one year? Something off?
8 Opinion