Commitment

Hello my name is Katie and I'm new here. Although a long time lurker trying to understand my Gemini guy actions. The ones that I don't understand on my own anyways 🙂
I am not sure what to call him. As nothing is officially official between us. I am here to learn how to initiate the conversation about commitment with my guy. We have been dating for two years and we were exclusive until about 1 month ago. We talked about being exclusive before and he understood the meaning of it but had an indiscretion with a girl he fell for rapidly.
Things started dropping if I may say a while back. He asked me to do a lot of sports with him. Everyday, all the time. Almost being needy and always wanting me. I said yes to him often, but not all time because I'm independent. But the more I said yes to him, the less he wanted to hangout with me. Things changed afterwards. He wanted to hangout with his friends rather than me. Ditched me a few nights, and I voiced how unhappy it made me. As the strong woman that I am, I wasn't going to let him treat me with no respect. I explained to him that it's not ok to say you are going to hangout with someone and let them wait at your house only to not show up.
He apologized, but didn't initiate any activities after our argument. Still talked to me about them though. I asked if he wanted to do said activities with me, but he wasn't into it so I stopped asking.
Some other aspects declined as well. He went from calling me baby, babe, love every day and all the time to rarely or only when he's in a good mood.
He is known to be moody and I think I'm pretty good at adapting. When he is in a bad mood, I talk to him less or only when he initiates a conversation. And when he is needy like last night and tonight, we have a blast, are like soul mates and really connect.
Things changed a week and half ago when he started texting a girl from work. It started as a friendly hello, to them flirting and talking about dating and having sex. It's like I wasn't part of his life anymore but still treated me like his girlfriend while talking to that girl.
I learned about it and we got in a pretty big fight. He denied everything and lied about it. Later saying that he did so because he was petrified of losing me over his indiscretion.

It ended up with me packing his things in a box, the ones he had at my house and me leaving the box outside. He knocked at my door all night, rang the bell and even came to yell at my window in order to get my attention. I ignored him as I didn't wanna throw my anger at him and say things I would regret later.
By the end of the night, his bother was at my door steps, asking me to talk to him or at least say if I wanted him back because my guy's stress level was higher than usual, thanks to his fear of losing me. I had a long chat with his brother about the whole situation. We agreed that my guy acted poorly and that things needed to change.
Me and guy went to dinner the following day and we talked about it. He answered all my questions and told me he fell for this girl and didn't know why.
We started talking about commitment and why he was chasing other girls when he had me in his life and he said he didn't know why he was doing it. He mentioned talking to 2 other girls as well but explained to me that they're not into him. Ignore him frequently but that he likes to chase them regardless.
I didn't push the discussion further, as I didn't wanna scare him off.

I want talk to him about him, I just don't know how and what to say.

In a perfect world, he would stop looking at other options. His brother and family told me many times that I am the perfect girl for him and that he is the only one not seeing it. Preferring chasing girls who ignore him or with whom he doesn't have any deep conversations like the ones we have every day.
Last night he mentioned going to dinner with a friend next weekend and a friend of ours told me that said girl think it's a date. They hooked up before and he apparently flirted with her.

I want him to understand that if he does do more than flirting, he is going to lose me forever. Something I know he doesn't want.

He doesn't sound as if he's ready for a girlfriend, and/or knows exactly what he wants. But he DOES want his cake & eat it too. He wants to string you along & see other women. He sounds young & immature, but some Gemini males likes it when a woman they're interest in ignores them...usually when they catch their prey, they lose interest.

Don't always be so readily available to see him. Learn to say no. He knows you're always going to be there so he doesn't take you seriously. Act as if you don't give a damn about losing him (even if you do)& don't allow him to see you being vulnerable at this point.