How do I make my boyfriend want to give me more attention/want me like he did in the beginning?

we live together (2yrs) & i feel like we are drifting apart. He says we spend all this time together because we live together, but the only time spent together is at bed, dinner or whenever we are having adult time (if you know what I mean) I've asked him to try to do this and that, he says he doesn't do those things, but he did in the beginning and I went through his phone (im horrible for invading privacy, I know, but I had a strong/weird gut feeling about it for a few days before I did anything) and I saw him being flirty & telling other people things I have been begging him to say/do. A few days out of the month I swear we are back to how we used to be and I get excited because I missed that, but a day or so later and it's back to the same excuses/lack of effort.. some might call me dumb, but I am so in love and I truly haven't felt this way about a man before. Like I truly thought this was going to be the person I married based off of everything we have been through together. Please give me any tips/tricks to make him look at me more, to want me more and most importantly how to get us back to how it used to be. I will admit I don't always do my "womanly duties" around the house (please dont comment on that, I currently do not work therefore I do not mind cooking and cleaning. And when I did work full time we split chores 50/50)

How do I make my boyfriend want to give me more attention/want me like he did in the beginning?
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