Im so confused & don't know where I stand - what would you do - does he even like me?

My guy of 4 months was home from the army last week & we had a lovely time. He brought me stacks of presents and we had a lovely week. The issue is - hes always moody. He bought us theatre tickets cos I spent a bit on his birthday & he really kissed me hard (he missed me) but after 4 months still have to ask him for sex. (hes always been like this so no changes) but I noticed he now takes his phone to the bathroom when hes on it & in his dressing gown in bed. Ive been cheated on & this is plain odd 2 me & he knows that. It may be cos he knew I went through his phone once.

He popped out for food for us & took his ipad & his phone? Now is it cos he knows I will nose at them? He spent a fortune on presents for me when he got home cos he was working at Wimbledon & he said 'I love you, you know' when he got home. I was in bed & noticed him using his phone away from me & closed it when he realised I was awake so I asked him ''Are you cheating, cos you know my ex did, I'd rather be single than go through that again' He just went crazy & said 'no for F***s sake, your making me annoyed' ive asked him before once & he said its insulting to him. But when we got together he said he likes dirty sex (great) but its never materialised & when I ask for sex I get it maybe once or twice
Added (1). i like dirty sex so was looking forward to it but hes nothing like that.
I don't know if hes all talk or what? He loves BJ all the time though & would rather them than sex & stimes when I moan he finally gives n but its fast and over quickly with no enjoyment for me.
He is a lovely guy with huge heart but im so confused. I just want my boyfriend to fancy me willingly. When we says bye he hugs me, no eye contact & quick kiss like he don't care but when hes home he said 'missed me so much.
Added (2). He likes staying in bed a lot which I think 'great lets fool about' but he just likes hugs & that's it. He seems to really care cos he makes plans for our future all the time & he just got me expensive theatre tickets for early birthday present. But im scared he just wants company cos lonely when home. He has told me hes been cheated on too & only relationships hes had in last few yrs are 3 months long & they dump him. Maybe cos his attitude sucks - we've been together 4 months now!
Added (3). What am I meant to do? Hes waited years to get with me & now we together he says 'Im your guy, im never letting you go, I love you' He has habit of staring at me when im not looking and he rubs my head affectionately & when we do have sex he stars right into my eyes. Is he using me or just not upto an active sex life? But he talks so dirty when we go together, now he doesn't act on it, its disappointing & I saw male enhancing tablets in his cupboard used so has he got a problem? Im so confused

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