@Dalesrose it would be prudent to withdraw from the house purchase, as a first step.
Buying a house is a massive undertaking for most of us but for you it has also brought into sharp focus, your relationship.
Throughout your posts, these are the stand outs;
I do love my boyfriend and he loves me but the long distance is really hard.
he just isn’t home enough for me
it’s more the commitment with my partner that I am scared of
This isn’t the life I had planned for myself with him being a way all the time
He is quite lazy and doesn’t have the same aspirations in life as me
I then feel like I am compromising so much
All I ever wanted was someone to stand by me and love me and I feel like I have that but I am still not happy.
but can I live in unhappiness but what if I never find anyone
Many would see 5 years as long term, it is, but you're still not happy.
You may have another 50-60 years ahead, would you really want to spend that whole time unhappy?
You ask, "what if I never find anyone"?
If you continue to maintain an unhappy relationship out of fear, you will never find anyone else.
Do not fool yourself into "the sunk cost fallacy" with this person.
The life you really want, is yours for the taking @Dalesrose you do need to be brave though.
Wishing you peace and strength.