You are already doing some things that are NOT productive.
Stop chasing her, stop trying to impress her, stop seeking her approval. She likes that you're doing things, but she is slowly losing respect for a man who would grovel the way you are.
Tell us more if and when you can. What are the issues both now and previously in your marriage? Is this absolutely out of left field, or have there been things brewing for some time? Tell us about you. How do you think YOU have contributed to her dissatisfaction?
Right now, chill out. I suggest reading a good book on marital relationships. The MWD books (Remedy and Busting) are both good reads for you at this point in your situation. You need some focus, and most of that begins with YOU, not her.
Sounds like she wants some space, and you are not giving that to her by being the good little boy chasing her around seeking a pat on the head.
Time to man up my friend.
Blessings,
Bill
"Don't tell me the sky is the limit when there are footprints on the moon."