Guys, How can I get him back?

I have been spending about 6/7 months with a guy. The timing of when we started wasn’t great for either of us so we agreed to just have fun. We started hanging out about once a week, and then gradually twice and three times. He told me he has started talking to someone else. I realized that I do want to try with him and disclosed my feelings. We spend time and talked after he told me he had those feelings for me before, but because that’s not what we agreed to so he didn’t let himself have those feelings and he’s interested in this other girl (who he’s been talking to for a month). What I can I do to try and get him to have those feelings again.

Guys, How can I get him back?
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