I don’t know what to do...

Hi I’m 25 and have been on and off with my partner for 10 years now. We used to live together but he switched his degree completely mid way/near the end and had been living 3hrs away for the last 3yrs and so we were doing long distance - until Covid obvs, now it’s like just talking on the phone but barely because he refuses to call now & barely messages (I have confronted him about this numerous of times & feel unheard or uncared for). In fact, 6 months before Covid was even a thing, he stopped doing things like sleeping next to me during visits (like would leave me in the hotel after sex) and he never ever did this before in all the years I known him. I spoke abt how this hurt me and he just kept promising it was coz of a one off emergency but did it literally a whole year. I suspected he is cheating or got like a girl pregnant and in a weird situation - but he refuses to tell me what’s up & refuses to break up with me. If I try leave or block he just contacts through another number or means and because I love him and want it to work so bad because I put everything financially, emotionally and mentally into us I don’t know what to do. Like I have confronted him about all this nicely & harsh toned but I get no explanations for his odd behaviour and feel trapped & lonely. I don’t know if he’s lying or telling the truth. He’s now doing things like staying online til 4am but still not really talking to me... yet won’t accept me leaving him so I just don’t get what’s going on. I have tried figuring it out in person and from a distance and just don’t know what to do now...