I have been with my fiancé for a little over two years. He moved here from Texas after dating online for about 6 months. We are currently expecting a baby which will be his first, but will be my third (my other two are from my previous marriage)

When we first began dating online, we would see each other once a month for about 7 days each time. While together we would have sex about 4-5 times, which for me was perfect while long distance, I didn’t expect it that much under normal circumstances.

When he moved here I didn’t realize the drastic change our sex life would take. Initially it would occur around 3 times per week, but after a few months, went down to around 2 times every couple of weeks. By the time we conceived, we were having sex once a month; I know the EXACT date of conception because of this.

Since getting pregnant it is occurring maybe 1 time every 3 months, and he never initiates, I have to, and I am lucky to get more than 5 minutes, foreplay doesn’t exist. When I bring up the issue, he reassures me of the love he has for our family, and tells me that he would never jeopardize what we have, when he says these things, he seems sincere.

I have never had distrust issues before this relationship, and I am beginning to hate myself for feeling this way, but to be with a healthy 27 year old man (I am 29) who, over the years, had quite the sex life, it is hard to discount the possibility of infidelity. Adding insult to injury, he still masturbates.

I have tried having conversations with him about "spicing" things up, more foreplay, different positions, anything I can think of I ask him what he would think about it, and honestly, he seems completely disinterested, it is as though he participates in the conversations to appease me.

There are none of the telltale signs: pornography, mood changes, running off to check his phone or to “run errands”, or late nights at work. I check our phone bill and his email accounts regularly, I call him while he is at work to "see how his day is going", and I look through his wallet.

I am constantly looking for "evidence" that he is cheating on me, but come up with nothing, except for today; his car smelled of vanilla, when asked he said he didn't know why it smelled that way. I know his boss has vanilla air freshener, because of a running joke we have with him. So that could be the cause, but even still... why hide that?

Other than when he is at work, he would have zero time to be unfaithful because he is always home.
I am so lost.