Sorry I got more question to ask.. What should I do..

to grow love you need patience and warmth. You must learn to watch and be attentive to the person.
But first you must stop planting flowers in another woman's garden. All the happiness you bring to him will benefit her, not you.
It hurts very much, but you must let go of this man to find the one with whom you can grow your own garden.
I too have loved men who were looking around to their past, I wasted the warmth and love I gave them. Now I have a man who deserves to be loved and sometimes I am not as nice with him as I should be because my heart was damaged when I cared for those who did not deserve my love.
Let him go, it does not matter if he goes to her or not, he is another woman's man whether it is his ex or another. If he were yours he would never consider looking at his past for fear of missing out with you.
Look for the one who is ready to be found, plant flowers in a shared garden. Shared only by the two of you. You will grow wonderful love there.