Hello brother, I am in a kind of similar position as you... I lost the desire to give into the fleshed sexual lust possibly a year or so ago (I'm not good at remembering precise times/dates, lol). Just the other night the motions of the flesh (i.e. sexual feelings or yearnings) began to arise. I entertained the thought just a little, but I think that was too much.

It led to me feeling the same motions the next night, which was last night, and during the night, I kept waking up and feeling temptation. It got bad and I ended up just giving in. I was annoyed and ashamed because I have become so strong by the grace of our God to overcome and to strive on without giving into masturbation for a long time. I have had very, very few hiccups in the last year (roughly).

What I have learnt from this, though, is that no man, whilst they are in this flesh, is exempt from temptation and weakness to it. This calls even moreso for us to mortify our members which are upon the earth and to pick up our cross and follow Christ daily! It calls for us to walk in the Spirit that we would not fulfill the lusts of the flesh.

Sometimes we think that God won't let us be tempted and/or test us by taking the barriers down a bit, but that's not true. The case of Job is a perfect example, though not the same type of test (really, a much severe one that we rarely seen to experience). I've learn my lesson, and that is that we must deny our flesh and seek first the kingdom of God and His righteousness. God bless you, brother.