well u know ur stuff, everything has an expiry date and him chasing u might stop and by that time, u will probably regret not claiming ur alpha. yes, he might not love u as deep and is just probably saying all those responsibility stuff as he marked u accidentally but he was being sincere abt the marriage and stuff, i bet u would never find a guy like that again, alphas are just bullshits after all.
2D-sama tachi, daisuki desu dakara kekkonshite kudasai ( ꈍᴗꈍ)