How to show her that I'm better than the other guy?

so me and this girl have been talking for the past two months again (we dated for two years before) and recently she has been talking to this other guy (they've been talking for like a week and a half). she said that she likes him but has feelings for me as well. I truly love her, and think shell get over him. I just was wanting to hear some other ideas to show her the feelings that she has for me.
How to show her that I'm better than the other guy?
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