Married 18 months many problems

Hi I've been married 18 months aged 27. For about the last 6 months we have been fighting, my husband says I don't make enough effort, we don't have sex enough, I don't do special things for him. For the first year or so we did fight but that's not unusual for us. He has always been attentive and done nice things for me, and said he does them because I was a great wife, I deserved them, he was happy etc. basically I didn't have a reason to be afraid. I have suffered with low self esteem my whole life which has affected our sex life and my confidence, even just to do something nice or something spontaneous and present it to him and be excited that he'd like it. Recently he's been messaging two other girls and I know he has feelings for them both or at least one. This makes me feel even worse, even more unable to do anything. Everything I've tried so far he has not liked. Should I just give up or should I keep trying? Knowing he had feelings for someone else is draining the life out of me. None of my friends are in similar situation. Please help any advice appreciated!

Go through one whole day being nice to him, make him a great breakfast give him lunch. And when he comes home make a very romantic dinner. Then get over your self esteem. He married you, for you. Obviously he likes what he sees! & go for it! Make the intercourse romantic make him feel amazing that's what he needs