Is he trying to make me jealous?

So recently my ex tried to get me back (literally begging me and he’s been trying to get with me since the break up) and I turned him down because I didn’t feel like he truly wanted me and plus I was talkin to someone else(I told him not nothing seriously though) and I was trying to move on because I didn’t think he wanted me anymore and I could tell that hurt his feelings when I told him I was talking to another guy(I promised I would be honest with him no matter what and he’s always honest with me about everything regardless if it makes me mad or not). I asked him if we could still be friends and he didn’t want that but he went along with it anyway. A few days later I asked him if he still wanted to go out of town with me and he said “he wants to but no” but he didn’t tell me why.

A few days later he posted this girl on his Instagram saying “crush” and covering her face with an emoji (My friends showed me). I didn’t know until later on and I asked him y he didn’t want to go out of town with me anymore because he wanted to go so bad and he still didn’t tell me why until like 30 minutes into the conversation about us that he was talking to this new girl (He’s still single). I asked him if he was still in love with me and he said “yes, I’m just forcing myself to move on since u r talking to another boy”

He literally said everything that I said to him, to me (like moving on, there’s someone better, we can still be friends and go place, etc.) he’s immature and petty so this is not shocking to me because he has done things to see if I really care about him or not in the past after the break up. He’s still going out of town with me and he said he’s not going to put anything passed “us” so I don't know if he using the girl to make me mad or what, because he never posted a girl that he is not dating yet on Instagram and he said he doesn’t know if he’s taking her serious or not(so y would post her if it’s not serious yet?).

He was talking to other girls too,trying to get different girls attention, etc., I just never took it to heart like the way he did, it’s like he has double standards.

I wanna fight for it but idk where his mind and heart is at, I just wanted him to try harder so I could see he genuinely wants this since he was the one who broke up with me. We are still in love with each other and I just think we are trying to force ourselves to move on instead of working it out, because we broke up amicably(no infidelity or anything, it was really just stupid honestly) and it’s obvious we still have strong feelings for each other.